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Sum of n Terms

Sum to n term...

Question

Sum to n terms the series , whose nth term is 2n + 3n -1.

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Solution

an=2n+3n-1
a1=2+3-1=4
sn=n(a+l)/2
=n(4+2n+3n-1)/2
n(3+5n)/2
=(3n+5n*n)/2

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