Question

Express the sum in terms of summation nation: 5/13 + 10/11 + 15/9 + 20/7

Answer 1

You have four terms in the form a/b.

So the basic notation should look something like this
\[\sum_{k=0}^{3} \frac{ c _{1} + c_{2} k }{ c _{3} - c_{4} k }\]where c1, c2, c3, and c4 each are some constant integear you'll have to find so the expression matches the given summation.