given l=28,S=144,and there are total 9 terms.find a. – InterviewSolution

1.

given l=28,S=144,and there are total 9 terms.find a.

Answer»

Sum of n terms of AP= n/2(first term + last term)Given S = 144, l = 28, n = 9, a=?

Then144 = 9/2(a + 28)16*2 = (a + 28)a = 32 - 28 = 4

Value of a= 4

I got it tq

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