New posts in Combinations

Find limit $\lim_{n\to\infty}\sum_{k=n}^{5n}{k-1\choose n-1}\left(\frac{1}{5}\right)^{n}\left(\frac{4}{5}\right)^{k-n}$

What's the number of decibinary numbers that evaluate to given decimal number?

How many different figures can be formed with a regular polygon of $n$ vertices and a number $d$ of diagonals of this polygon?

Calculating Minesweeper Odds Is this calculation correct?

Calculating odds of Minesweeper is this correct?

Flaw in reasoning: number of ways to choose at least 1 man and 1 woman

How many ways can you arrange all letters in the word "management" so that at least one "m" is adjacent to one "a"?

proving the identity $b^3 = 6\binom{b}{3} + 6\binom{b}{2} + b$ for $b \in \mathbb{N}$, $b > 2$, by counting a set in different ways

The best $n$-digit password?

"Elegant" way to assign 4 distinct objects into 4 bins