Math, asked by koushik2353, 1 year ago

A.P is -4 and t20=53 find s20

Answers

Answered by Jk15

0

what is -4 in the question

is it t1

if -4 is t1

then s20 = n/2(t1+t20 )

s20= 20/2(-4+53)

s20=10(49)

s20= 490

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