Math, asked by pradeepgowda7128, 1 year ago

Find the sum of first twenty terms of arithmetic series 2+7+12+........using suitable formula

Answers

Answered by gurjan12singh12

20

a=2and d = 7-2 =5

s20 = n/2( 2a+(n-1)d)

s20=20/2(2(2)+(20-1)5)

= 10(4+95)

=10(99)

= 990 ANSWER

gurjan12singh12: please select my answer as the brainliest please

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