Sum of the series S=1+1/2(1+2)+1/3(1+2+3...

Sum of the series `S=1+1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+...........` upto `20` terms is

A

110

B

111

C

115

D

116

Verified by Experts

The correct Answer is:

C

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