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6h
asked Sum of three cross products is zero.
2d
answered Calculating some probability of buying different cards
2d
answered Combinatorial Proof for Binomial Identity: $\sum_{k = 0}^n \binom{k}{p} = \binom{n+1}{p+1}$
2d
answered Finding amounts of ingredients in a food based on nutrients
2d
answered Ram shoots every third penalty to goal.If he gets chance to shoot all 5 penalty shots.What is the probability that he converts (does) exactly 3 goals.
2d
answered If $|xH|$ has order $n$, then there is an element $y$ with $|y|=n$ and $xH=yH$
Aug
23
answered $S$ is a non empty set and there are $a$ and $b$ for $c$ and $d$ such that $a\cdot c = d$ and $c\cdot b = d$, prove it is a group
Aug
23
answered Seating people around a circular table (elementary counting technique)
Aug
23
answered What is the smallest prime $p$ such that the next prime is greater than $p+2000\ $?
Aug
22
answered Is $S(a \cdot b)$ always less than $S(a) \cdot S(b)$
Aug
20
answered If $f:X \to Y $ is continuous then $f^{-1}(\emptyset)= \emptyset?$
Aug
20
asked Tzaloa 2015 game problem (piles with $1,2,4 \dots 2^{19}$ coins each)
Aug
20
answered Prove that it is NOT true that for every integer $n$, 60 divides $n$ if and only if 6 divides $n$ and 10 divides $n$.
Aug
19
asked Slick proof that if an open set contains $\mathbb Q$ it has all irrational numbers, except a countable amount.
Aug
17
answered Probability of a natural number being divisible by 2, 3, or 5?
Aug
17
answered Find all integers such that $2 < x < 2014$ and $2015|(x^2-x)$
Aug
15
answered Permutation & Combinations - Distribution
Aug
14
answered Is this a correct proof that $\tau(n)$ is eventually smaller than any $n^{\delta}$, $\delta>0$?
Aug
13
answered Permutations where no partial sum is divisible by 3 (contest question)
Aug
13
answered Let $G$ be a group and $H\le G$ and $a\in G$. which ones are always correct?