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 Oct 21 comment Solve $x^2 = I_2$ where x is a 2 by 2 matrix how can i write one of those here? Oct 21 asked Solve $x^2 = I_2$ where x is a 2 by 2 matrix Oct 20 accepted How to solve step by step $\frac{2n+1}{n+2} < 8$ Oct 20 asked How to solve step by step $\frac{2n+1}{n+2} < 8$ Mar 24 awarded Notable Question Mar 14 awarded Critic Mar 14 comment How to compute the sum of every $k$-th binomial coefficient? I'm in a high school class, we haven't even done integrals and derivatives. There must be a somewhat easier way without requiring FTs. Mar 14 revised How to compute the sum of every $k$-th binomial coefficient? edited body; edited tags Mar 14 comment Sum of every $k$th binomial coefficient. By summing those equations, you would get $(1 + 1)^n + (1+\omega)^n + (1+\omega^2)^n =$ the sum of every third coefficient. But how do you get the closed form on that sum? Mar 13 revised How to compute the sum of every $k$-th binomial coefficient? added 254 characters in body Mar 13 revised How to compute the sum of every $k$-th binomial coefficient? deleted 45 characters in body Mar 13 comment How to compute the sum of every $k$-th binomial coefficient? Yes, I noticed that too so perhaps I misunderstood something. Mar 13 asked How to compute the sum of every $k$-th binomial coefficient? Feb 8 comment How many words can be obtained using 2n letters? And I assume the same kind of reasoning goes for the generalized case with k letters. Feb 8 accepted How many words can be obtained using 2n letters? Feb 7 asked How many words can be obtained using 2n letters? Jan 10 awarded Yearling Dec 23 awarded Popular Question Dec 2 accepted Preservation of surjectivity when composing functions Dec 2 accepted Help in understanding integration by changing the variable