Question: Find a formula for the n t h partial sum o f the series and use i t t o find the series' sum. 9

Find a formula for the nth partial sum of the series and use itto find the series' sum.
91*2+92*3+93*4+cdots+9n(n+1)+cdots
A.sn=9nn+1;s=9
B.sn=9(n+1)n;s=9
C.sn=9(n+2)n+1;s=9
D.sn=9(n+1)n+2;s=9
Find a formula for the n t h partial sum o f the

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