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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