Doug Smith's user avatar
Doug Smith's user avatar
Doug Smith's user avatar
Doug Smith
  • Member for 11 years, 5 months
  • Last seen more than 7 years ago
11 votes
4 answers
21k views

How would I figure out how many anagrams of mississippi don't contain the word psi?

6 votes
4 answers
10k views

Could someone please explain to me how (p ∨ q) = (p NAND p) NAND (q NAND q)

5 votes
1 answer
1k views

What are a list of helpful boolean identities for solving boolean functions?

4 votes
3 answers
20k views

Finding the parity check matrix for $(15, 11)$ Hamming Codes

4 votes
3 answers
123 views

How does this textbook go from this step to the next in proving this?

4 votes
1 answer
134 views

How did my professor change this logarithm into the next one? [duplicate]

3 votes
2 answers
14k views

How do I prove that a function grows faster than another? [closed]

3 votes
2 answers
1k views

Where is the value of the variable $\epsilon$ obtained in the following explanation my professor gave?

3 votes
3 answers
473 views

Solve $2x\equiv 18\ (\operatorname{mod} 50)$

3 votes
1 answer
3k views

Could anyone explain how my textbook gets this modulu congruence statement?

3 votes
5 answers
312 views

Find smallest number m such that $9^{32} + 19^{433} + m$ is divisible by $4$

3 votes
1 answer
117 views

I don't think I'm doing this function mapping question correctly, could anyone offer advice?

3 votes
3 answers
147 views

I'm asked to give a combinatorial proof of the following question, how would I go about doing it?

2 votes
2 answers
69 views

Is my answer to this combinatorics question correct? Counting the number of functions where $F(a) = F(b)$?

2 votes
3 answers
40k views

How to solve for the amount of arrangements of books on a shelf?

2 votes
2 answers
101 views

How is $\frac{x}{(1-x)^2}$ the equation for the sequence $0, 1, 2, 3, 4,\dots$

2 votes
1 answer
912 views

How do I calculate the cdf over this range? I'm very confused.

2 votes
3 answers
2k views

Find the necessary and sufficient conditions on $a$, $b$ so that $ax^2 + b = 0$ has a real solution.

2 votes
2 answers
71 views

New to generating functions - how do I get the function from the sequence defined by $a_n= n$ for $n\geqslant 0$?

2 votes
1 answer
1k views

How would I go about solving this statistics question on permutations?

2 votes
2 answers
544 views

If I have a vector inside a rectangle, how do I tell which side of the rectangle the vector will hit?

1 vote
1 answer
69 views

How does my textbook come up with this statement? I don't believe it to be true.

1 vote
2 answers
621 views

How does my textbook solve this summation equation for the answer?

1 vote
3 answers
85 views

How does my professor go from this logarithm to the following one of a different base?

1 vote
2 answers
95 views

How does my professor come up with the recursive case in this algorithm analysis?

1 vote
3 answers
326 views

Could anyone explain my prof's proof here for the induction of every natural number is congruent modulo 9 to the sum of its digits?

1 vote
1 answer
3k views

How do I find the number of bit strings with 3 consecutive 0s in a bit string of length n?

1 vote
1 answer
68 views

Did I do this probability question right?

1 vote
2 answers
185 views

Can someone explain what this paragraph is saying more clearly?

1 vote
1 answer
119 views

Could anyone explain how my textbook did this simplification?