Question

What is the formula of sum of an AP?

Answer 1

Answer:

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

is the formula of sum of AP.....

Answer 2

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$sn = \frac{n}{2} (a + l) \\ \\ or \\ \\ sn = \frac{n}{2} (2a + (n - 1)d)$

Step-by-step explanation:

a=first term

d= common difference

l=last term

n=nth term

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