Question

find the sum of the first 16 terms of ap 2,7,12...​

Answer 1

Step-by-step explanation:

we know that Sum of A.P=n/2(2a+(n-1)d)

Given:-

n=16, a=2, d=7-2=5

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

S16=16/2(2(2)+(16-1)5)

S16=8(4+(15)5)

S16=8(4+75)

S16=8(79)

S16=632

then the sum of first 16 term of A.P is 632

may be answer of this question is right....

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