Compute the following sum for any x?
$\sum_{n=0}^\infty {(x-1)^n\over (n+2)!}$
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 $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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