Question

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

Step-by-step explanation:

given nth term =2n+1

1st term =2.1+1=3

2nd term=2.2+1=5

3rd term=2.3+1=7

sum of 1st 3 terms is=3+5+7=15