How can I prove that the limit of $n^2/4^n$ as $n$ approaches infinity is 0?I want to solve it without using de l'Hospital's rule and I tried some inequalities, but I don't find a nice solution.
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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