Question

sum of n terms of an A.P​

Answer 1

Answer:

Sn = n/2 (2a+(n−1)d), THIS IS THE ANSWER

Step-by-step explanation:

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Answer 2

Answer:

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

Step-by-step explanation:

The formula to find the sum of n terms in AP is

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

Where a = first term,

n = number of terms,

and d = common difference between consecutive terms.