Compute the following sum for any x?
∑∞n=0(x−1)n(n+2)!
I am having trouble to compute that sum. It looks like geometric series but I don't know where to start. Can everyone help me with some hints? Thank you.
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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