Question

The first term and the last term of an arithmetic progression are 1 and 11 respectively. If the sum its terms is 36, then its number of terms will be​

Answer 1

Answer:

here is your answer :A= 1

L = 11

Sn = 36

=> n( a +L) /2 = 36

=> n(1+11)= 72

=> n *12 = 72

=> n = 6

No.of terms = 6