Question

Write the formula to find the sum of the first n terms of an arithmetic progression whose first term is a and last term is a n

Answer 1

sum of n terms of an AP is

S= (n/2)[a+(n-1)d]

where S is sum , n is number of terms, a is first term , d is the difference

Answer 2

Answer:

n/2(2a+(n-1)d)

Step-by-step explanation:

given a=a

n=an

hence the formula to find the sum of these arithemetic progression is

Sn=n/2(2a+(n-1)d)