Find the sum of n terms of following series:
1⋅3⋅22+2⋅4⋅32+3⋅5⋅42+⋯
I was trying to use Sn=∑Tn, but while writing Tn I get a term having n4 and I don't know ∑n4. Is there any other way find the sum?
I have injection f:A→B and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...
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