Thursday, 17 November 2016

algebra precalculus - Using an identity to simplify the sum

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.

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