Math, asked by solankimarlin6, 3 months ago

Find the sum of first 20th terms of the A.P 5, 13, 21.... .

Answers

Answered by induu2345

0

Answer:

a = 5

d = 13-5 = 8

s20 = 20/2(10+19×8)

s20= 10×(10+152)

s20= 10×162

s20= 1620

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