So I ran into this problem today. It asks me to use an identity to simplify the sum.
$$\sum_{j=7}^{27}\ln\left(\frac{j+1}{j}\right)$$
I have no idea where to start. I don't know any identity that fits this formation. Thanks.
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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