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 Oct21 comment Solve $x^2 = I_2$ where x is a 2 by 2 matrix how can i write one of those here? Oct21 asked Solve $x^2 = I_2$ where x is a 2 by 2 matrix Oct20 accepted How to solve step by step $\frac{2n+1}{n+2} < 8$ Oct20 asked How to solve step by step $\frac{2n+1}{n+2} < 8$ Mar24 awarded Notable Question Mar14 awarded Critic Mar14 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. Mar14 revised How to compute the sum of every $k$-th binomial coefficient? edited body; edited tags Mar14 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? Mar13 revised How to compute the sum of every $k$-th binomial coefficient? added 254 characters in body Mar13 revised How to compute the sum of every $k$-th binomial coefficient? deleted 45 characters in body Mar13 comment How to compute the sum of every $k$-th binomial coefficient? Yes, I noticed that too so perhaps I misunderstood something. Mar13 asked How to compute the sum of every $k$-th binomial coefficient? Feb8 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. Feb8 accepted How many words can be obtained using 2n letters? Feb7 asked How many words can be obtained using 2n letters? Jan10 awarded Yearling Dec23 awarded Popular Question Dec2 accepted Preservation of surjectivity when composing functions Dec2 accepted Help in understanding integration by changing the variable