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5h
comment If x is even, then x is not divisible by 5.
yes, that is a good counterexample.
10h
revised Question about triangle-free graphs
added 180 characters in body
10h
answered Question about triangle-free graphs
17h
comment Calculating some probability of buying different cards
Does my solution run in time? What is the maximum number of test cases?
1d
asked non-countable subset of $\mathbb 2^{\mathbb Z}$ with finite pairwise intersection.
1d
comment If $(a+b)^n=\sum_{k=0}^{n}{n\choose k}a^{n-k}b^kc_k$, then $c_k=1$?
I think it's clear as day the OP doesn't understand his own question.
1d
comment If $(a+b)^n=\sum_{k=0}^{n}{n\choose k}a^{n-k}b^kc_k$, then $c_k=1$?
We are not incorrect, we all answered different questions, (the question I answered is the easiest). It tells you there is more than one possibility for the $c_k$'s when $a,b$ and $n$ are fixed. The problem is not clearly stated, that is the problem.
2d
answered What is $1+2+4+8+16+…+2^n$?
2d
comment What is $1+2+4+8+16+…+2^n$?
It is $2^{n+1}-1$...
2d
comment Which Area of mathematics can explain this?
It looks like simple geometry.
2d
comment Convergence Events with States
Fixed, thank you.
2d
revised Convergence Events with States
added 4 characters in body
2d
comment In what ways would a course on convex optimization be useful in game theory?
convex optimization is not a subset of game theory.
2d
revised Convergence Events with States
added 2 characters in body
2d
answered Convergence Events with States
2d
accepted Sum of three cross products is zero.
2d
asked Sum of three cross products is zero.
Aug
26
comment Average length of a cycle in a n-permutation
do you count cycles of length $1$?
Aug
26
accepted a matrix of rank $r$ satisfies a polynomial of degree $r+1$.
Aug
25
revised Finding amounts of ingredients in a food based on nutrients
deleted 2 characters in body