A deck of cards contains $26$ black and $13$ red cards, taking out the cards in a particular way, what is the probability the last card left is black

Are primes (ignoring $2$) equally likely to be $1~\text{or}~3\pmod 4$?

Why is this the coequalizer in $\mathbf {Set}$?

"Calculus 4th Edition" by Michael Spivak -- Chapter 11 Problem 59

Find all $x$ such that $\sin x = \frac{4}{5}$ and $\cos x = \frac{3}{5}$.

How to show that $f:V\to V$ is linear?

Find polynomial with some conditions

On $\mathcal{A}$ with $\forall C\in\mathcal{P}_{\infty}(\mathbb{N})\exists A\in\mathcal{A}:A\cap C\in\mathcal{P}_{\infty}(\mathbb{N})$

Why do Carmichael numbers (appear to) frequently end in $1$?

The closed-form solution of the family $\sum_{n=1}^{\infty} \sum_{m=1}^{\infty} \frac{1}{nm(pn+m)}$?

Solving equations of nested sums.

Product of ideals is a subset of an intersection of ideals

Which courses from a math department would cover quaternions?

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