Question

if nth term of an AP is 2n+1 , what is the sum of its first three terms??

Answer 1

Answer:15

Step-by-step explanation:

An=2n+1

A1=2×1+1=3

A2=2×2+1=5

A3=2×3+1=7

S3=3+5+7

S3=15

Answer 2

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