Question

4. What is the formula to calculate the sum of the first n terms of an AP.​

Answer 1

Step-by-step explanation:

The formula to calculate the sum of the first n terms of an AP:

$\color{gold}\large \mathtt{Sn = \frac{n}{2} \: \times 2a + (n-1) d}$

where,

n = no. of terms

a = first term

d = common difference

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