Question

If a is the first term, a is the common difference and n is the number of the terms in an ap,then write the formula used to find its sum to first n terms ​

Answer 1

Answer:

an=a+(n-1)d

Step-by-step explanation:

an is the nth term

a is first term

and d is the comman difference

Answer 2

THE SUM IS

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