Math, asked by panduselvi895, 2 months ago

find the sum of 2,5,8,to 20 terms using the formula

Answers

Answered by induu2345

1

Answer:

a = 2

d = 5-2=3

n = 20

s20= 20/2(4+(20-1)3)

s20= 10(4+57)

s20= 10(61)

s20= 610

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