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Prakhar Nagpal's user avatar
Prakhar Nagpal's user avatar
Prakhar Nagpal's user avatar
Prakhar Nagpal
  • Member for 7 years
  • Last seen more than 1 year ago
4 votes

In how many ways can $n$ dogs and $k$ cats be arranged in a row so that no two cats are adjacent?

4 votes

Proving the following quadratic inequality?

3 votes

Understanding the binomial expansion for negative and fractional indices?

2 votes

Prime numbers of the form $6k\pm 1$

2 votes
Accepted

Error in calculation of number of ways to put $20$ identical balls in $4$ labelled boxes if each box contains at most $18$ balls

2 votes

Proof that $x^{(n+4)} \bmod 10 = x^n \bmod 10\,$ for $\,n\ge 1$

2 votes
Accepted

Must $ax + by = d$ and $ax + cy = e$ system of equations contain one solution given the constrains?

1 vote

simplify summation with binomial coefficients

1 vote

Permutations for possible codes

1 vote

how to find the interval at which a derivative function is increasing

1 vote

Relation between Combinatorics and Sum of First $(n-1)$ Natural Numbers

1 vote

Solving Permutation

1 vote

How many 4-letter words can be formed by the word mississippi so we have letter i in all arrangements

1 vote

how many $5$ digit numbers can be made

1 vote

There are $4$ blanks. Each one has a possibility of different letters/numbers. How can I get all combinations?

1 vote

counting combinations of 3 letters

0 votes
Accepted

Ways to choose players in tennis match

0 votes

The sum of the first $n$ terms of an arithmetic sequence is given by $3n+2n^2$. find the common difference of the sequence

0 votes

Simpler Derivation of $\sin \frac{\pi}{4} = \cos \frac{\pi}{4} = \frac{1}{\sqrt{2}}$,

0 votes
Accepted

Two basic combinational methods questions

0 votes

In a square ABCD with side 14cm, 2 quadrants were made with centres A & B respectively and AB as radius. Find area of region I and II

0 votes

Find radius of a cylinder with the biggest area surface inscribed in cone

0 votes

Identical Dice and "Identical" Sum (or Boxes??)

-1 votes
Accepted

Probability of getting a red ball when picking 5 from 10 in a bag