Questions related with (base 2) representation of numbers and their unique properties arising out of number representation.

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Probability that two numbers differ by one bit

Assuming that t is the bit length of the numbers and that we can pick 2 random numbers (the same number cannot be chosen twice), which is the probability that the two numbers will differ by exactly ...
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5answers
113 views

Why are sums of powers of 2 able to give all numbers?

It is known that If we sum up a combination of numbers that are positive powers of 2(starting from 0 to infinity), we can get any number possible. (Correct me if this is wrong). Can anyone ...
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1answer
40 views

Why is 2's complement called this way?

So, I'm preparing for a test and one of the preparation questions is as follows: I can tell easily that 'a' and 'e' are just wrong and therefore these answers are irrelevant, but taking a look at ...
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1answer
41 views

How many bits to represent this integer?

If $$x = \left(\frac{n+1}{4}\right)^{(n+1)/2},$$ then how many bits do we need to represent $x$ in binary?
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1answer
44 views

Binary Integer Programming

I need to form teams. There are 8 projects and 60 students. Each project has different requirements. For example, out of 5 total requirements, project 1 has 2 requirements: must have a programmer and ...
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3answers
51 views

Why does the division algorithm work for converting between number bases?

I know and have observed that the the division algorithm can be used to convert any number in the decimal system to the binary system. However, I have tried searching for an intuition of why this ...
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0answers
17 views

Closest finite series representation of original number < 1

I have another question related to this Decompose negative power of ten in finite series. Suppose we have number $0.1$ decomposed in finite sum of two in negative power: $10^{-1} = 2^{-4} + 2^{-5} + ...
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1answer
28 views

Decompose negative power of ten in finite series

Suppose we have numbers $10^{-1}, 10^{-2}, 10^{-3}, ..., 10^{-n}$. We need to represent each number by its closest representation that is less than original by means of finite sum of two in negative ...
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1answer
21 views

Number of ways to choose rows with inclusion condition

I have a large collection of lists consisting of 1's and 0's, each list the same length. I call each list a row. I want to know the number of ways to select rows such that their cumulative OR results ...
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1answer
43 views

External operation: binary and unary perhaps???

Consider the following examples from which some definitions are derived: Let us take an element from the set R of real numbers (say, the number 8) and another from the set L of lengths (say, 4m). ...
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1answer
39 views

Given a binary number, how do we get the last decimal digit?

Given a binary representation of 25 i.e 11001, if I am interested only in the last decimal digit, how do I get it?
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1answer
14 views

Binary addition preserving Hamming weights

Let $x,y$ be two $n$-bit strings, with Hamming weights (number of $1$ bits) equal to $w_{1},w_{2}$, respectively. Let $z$ be the binary representation of the sum $x+y$, where we interpret $x$ and $y$ ...
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3answers
87 views

Exponential generating function for the number of binary strings of length $n$

I know that the generating function of the sequence counting the number of binary strings of length $n$ is $e^{2x}$. But my book doesn't explain why this is the case. Could you give me a little more ...
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1answer
51 views

Does a bijection from the reals to the any binary form?

It is fairly simple to store all rational numbers in a binary format (not base 2) (a language composed of only 1s and 0s, no . marking) by simply storing one integer, a seperator, and another integer. ...
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3answers
27 views

binary representation of integers congruent 1 and 3 modulo 4

Let $k=b_nb_{n-1}\ldots b_3b_2b_1b_0$ be the binary representation of an odd positive integer. Prove: If $k\equiv 1 \mod 4$ then $b_1=0$. If $k\equiv 3 \mod 4$ then $b_1=1$. I think that to prove ...
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0answers
9 views

Using the algebraic expression ((x-2)+3) / ((2-(3+y))*(w-8)) show the results of performing a preorder, an inorder, and a postorder search.

Using the algebraic expression ((x-2)+3) / ((2-(3+y))*(w-8)) show the results of performing a preorder, an inorder, and a postorder search. Preorder is root, left, right. Inorder is left, root, ...
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2answers
64 views

How many bit-flips are required to achieve random distribution?

If I have a binary number W bits wide, initially all set to zero, and I repeatedly pick a random bit and toggle it from zero to one or vice versa, how many times would I need to do this to achieve ...
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0answers
21 views

Signed Number's Binary Addition

I'm going to discuss about Signed Number's Binary addition, I searched about it and even read books. Now I make little changes in it's logic and start my own logic to solve it. Let me show 4 bit ...
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1answer
37 views

Looking for expectation of the number of substrings

The question is formulated as follows: if we are given $n$ random binary strings of length $n$, what is the expectation of the number of substrings they have in common? Sounds pretty simple, but if ...
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5answers
144 views

Simplifying sum equation. (Solving max integer encoded by n bits)

Probably a lack of understanding of basic algebra. I can't get my head around why this sum to N equation simplifies to this much simpler form. $$ \sum_{i=0}^{n-2} 2^{-i+n-2} + 2^i = 2^n - 2 $$ ...
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1answer
23 views

Multiplication and binary xor

I have to prove one thing that combines logical xor and arithmetical sum of binary representation of some numbers. Could you direct me what can I read on this topic? Specifically, I need to prove ...
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1answer
19 views

What is the minimum length of maximal palindrome of a binary word of length $n$?

For example if we have $n=4$ then the minimum length of maximal palindrome is 2. Here are all four digit possible binary words along with their maximal palindromes: ...
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3answers
154 views

What is the last digit? [closed]

Consider all 100 digit numbers, i.e., those between $0$ and $10^{100} - 1$ (inclusive). For each number, take the product of non-zero digits (treat the product of digits of $0$ as $1$) , and sum ...
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1answer
44 views

Is binary more ideal than decimal? [closed]

We only chose the decimal system because we have 10 fingers. Binary is the most basic positional numbering system, so would it make sense to say that it would be the most ideal system? Is it better ...
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2answers
30 views

How many bytes with this configuration given in bits?

If the maximum number of bits of certain field is set to be 10 bits max. How many bytes can be set within this limitation? The solution of such a problem suggests number of bytes ranged is 1023. Can ...
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1answer
43 views

converting decimal to hexadecimal using division method

Okay so I know the basic procedure of converting a decimal number to any base-r is to divide by r and keep up with reminders until you reach zero. The reminders form the new base that is equivalent to ...
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0answers
30 views

Bitwise Operations and the Naming Convention of their Operators

So I just recently came across a bitwise operation on StackOverflow which shifts the bits in a binary number to the right while zero-filling from the left. The left side zero-filling overwrites the ...
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1answer
48 views

How to understand or derive the formula $Mantissa$ $bits$ $/$ ${log_2}$ $10$ = $Decimal$ $digits$ $of$ $precision$?

I asked a question a couple days ago about floating point precision on stackoverflow called, "Is floating point precision mutable or invariant?" and I received the following response. The formula ...
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3answers
447 views

What is the next number having the same number of bit 1s? [duplicate]

You are given a number, $A$, and you have to determine a number, $B$, such that $B>A$ and the number of $1's$ in the binary representation of $A =$ number of $1's$ in the binary representation of ...
2
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1answer
71 views

IEEE-754 Format Conversion

Represent 11.0011 x 2^10 using the IEEE-754 standard for 32-bit floating point representation. 0-Sign Bit 10001010-Exponent 1001100000000000000000-Mantissa Is this answer is correct ? I am bit ...
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1answer
34 views

Generating binary palindromes

I have the following Number Systems problem. "Given the numbers from 2-2047 (inclusive) represented in binary, how many are palindromes? The leading digit can't be zero." How would I go about solving ...
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0answers
73 views

Generator polynomial creates a 127 bit sequence

I have been reading a paper that states that a generator polynomial $$ G(D)= 1+ D^4+D^7$$ creates a 127 bit sequence which is as follows 00001110 11110010 11001001 00000010 00100110 00101110 ...
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4answers
221 views

Floor function to the base 2

I'm not a math guy, so I'm kinda confused about this. I have a program that needs to calculate the floor base $2$ number of a float. Let say a number $4$, that base $2$ floor would be $4$. Other ...
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1answer
22 views

calculation of binary power like $a^b$ where a,b are binary numbers

Is it possible to calculate power of binary number like $a ^ b$where a,b both are binary numbers.
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2answers
57 views

Calculating all possible sums of the numbers $2^0, 2^1, \ldots, 2^{(n-1)}$

Using the simple equation $2^{n-1}$ you get answers such as: $1,2,4,8,16,32,64,128,256,$ etc. How can I find all possible number combinations within this range? For example, then numbers $1,2,4,8$ ...
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0answers
20 views

Binary block code

I don't fully understand how i would construct binary block codes? As far as I know we have a code, say, $(5,4,3)-$code, then $5$ would represent the length, $4$ would represent the number of codes ...
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5answers
121 views

How many bit strings of length $12$ have a substring $01$?

My question is should it be $11C2$ or should it be $11C1$? Since $01$ are connected together, I take them as a single unit and there are $11$ different positions where they can be placed. Is the ...
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1answer
39 views

Probability of 2 n-bit binary strings lining up, given that the first k bits do so

There are two rows of 10,000 bits, one on top of the other, currently all set to 0. 00000000000000000... 00000000000000000... Now imagine that in each row, 40 of the bits are randomly flipped to a ...
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0answers
11 views

Is there a standard to follow when writing a weighted binary code (ex. 6-3-1-1 or 2-4-2-1)?

For example, in 6-3-1-1 code, 7 can be represented as 1001 or 1010. Similarly in 2-4-2-1 code, 6 can be represented as 1100 or 0110. My professor said that there is a standard to follow and there can ...
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1answer
26 views

A property of permutation codes

For $k\ge2$ and $M\ge k+2$ two integers, a permutation code matrix $C$ is a $\binom Mk\times M$ matrix which columns contain all distinct permutations of $M-k$ zeroes and $k$ ones. Page 44 of his ...
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2answers
81 views

How to populate a $0-$line with $1$'s?

I have a line of $n$ $0$'s like this: Zeroth index -->$000...000$ I want to populate the line with $m$ $1$'s with the following rules: (1) They have to occur after the index ...
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0answers
22 views

Learning Booth's Algorithm, I Can't Find the Issue on Final Result

I am practicing using Booth's Algorithm to multiply a positive number and a negative number (specifically the problem is $-12 \times 4$). I have included my attempt, but I can't find the issue. If ...
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3answers
37 views

Efficient algorithm for taking powers of binary numbers?

Is there any efficient algorithm for taking powers of binary numbers? Or even just squaring one? Thanks ahead of time.
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1answer
89 views

Why do we divide or multiply by 2 when converting binary?

Trying to understand the fundamentals of binary rather than just following steps, I wanted to know why do we multiply by 2 to convert a decimal (0.5, 0.25) to a binary and why do we divide by 2 when ...
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0answers
33 views

Binary division using polynomial

I want to do a division of two binaries and take the rest (mod). But I want to do this using polynomials, let's take the example: binary dividend: 010001100101000000000000 binary divisor: 100000111 ...
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1answer
24 views

Division binary using polynomials

I want to do a division of two binaries and take the rest (mod). But I want to do this using polynomials, let's take the example: binary dividend: 010001100101000000000000 binary divisor: 100000111 ...
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1answer
46 views

Computing the Value of a minimax tree

I am asked to compute the value of a minimax tree, which each node labeled with its initial value. I am just unsure how to do it. I know that it is a minimax tree if: the root is a min node, the ...
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1answer
20 views

Probabilities of a Binary String

You generate a random $N$-bit binary string, and compute $X = \Sigma_1^N x_i$, where the $x_i$ are the $0$ and $1$ entries of the string. What is the probability that $X$ is odd, if $N$ is odd? What ...
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1answer
80 views

the blood test riddle (number theory)

A microbiologist has been given a set of $100$ blood vials. Exact one of those $100$ vials is positive to a concrete disease X. The microbiologist desires to send only $7$ vials for analysis. He can ...
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1answer
35 views

Bitwise ops - The relationship between $a$, $b$, $a \wedge b$, $a \vee b$ and $a \oplus b$

In computer programming, the term bitwise operation is used to denote the use of boolean operators (and $\wedge$, or $\vee$, exclusive or $\oplus$) on corresponding bits of two numbers. Bits, in this ...