Question

if a is the first term and d is the common difference and N is the number of terms is an AP, then write the formula used to find it's sum to first n terms​

Answer 1

Answer:

sum of n terms = n/2 [2a+(n-1)d]

Step-by-step explanation:

given,

first term = a

common difference = d

number of terms = n

a.p. formed-> a, a+d, a+2d, . . . . . ,a+(n-1)d

sum of n terms = n/2 [2a+(n-1)d]

Hope it helps!