Math, asked by radhikapoddar234, 8 months ago

find the sum of the first 20 terms of the following: 9+20+35+54+77+..

Answers

Answered by Tanishh01

0

A= 9
D= 11
An = a+(n-1)D
An= 9 + (20-1 ) * 11
9 + 19 * 11
9 + 209
An = 218

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