Question

If the first and last term of an
A.P. are 18 and 82 respectively
then S25= *
O 2500
O 625
O 800
O
1250​

Answer 1

Answer:

S25=1250

Step-by-step explanation:

a=18

l=82

n=25

Sn=n/2(a+l)

S25=25/2(18+82)

 =25/2 x100

 =1250