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Formula for Sum of n Terms of an AP

The sum of n ...

Question

The sum of n terms of an arithmetic sequence can be calculated by .........................

S_{n} = \frac{n}{2} [2 a + (n - 1) d]

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S_{n} = \frac{n}{2} [2 a + (n + 1) d]

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S_{n} = \frac{2 n}{2} [2 a + (n - 1) d]

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S_{n} = \frac{2 n}{2} [2 a - (n - 1) d]

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Solution

The correct option is A $S_{n} = \frac{n}{2} [2 a + (n - 1) d]$
The sum of n terms of an arithmetic sequence can be calculated by $S_{n} = \frac{n}{2} [2 a + (n - 1) d]$
Where, n denotes the total number of terms
a = first term
d = common difference
$S_{n}$ = Sum of n terms

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