Question

if nth term of an A. P .is (2n+1),what is the sum of its first three terms

Answer 1

an = 2n+1
let n=1
a1= 2*1+1=3
let n=2
a2=2*2+1=5
let n=3
a3=2*3+1=7
S3 = a1 +a2 +a3
=3+5+7
=15

I hope this will help you

Answer 2

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