Question

What is sum of n terms of an AP?

Answer 1

Hey There!!

Sum of 'x' terms of an A.P=
Sn=n/2[2a+(n-1)×d]


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Answer 2

$s(n) = \frac{n}{2} (2a + (n - 1)d)$

I hope this will help you

-by ABHAY