Given: the sum of its terms is 36, the first and last terms of an AP are 1 and

11.

To find: the number of terms

Sum of AP using first and last terms is given by

36 × 2 = n (1 + 11)

n = 6

Given: the sum of its terms is 36, the first and last terms of an AP are 1 and

11.

To find: the number of terms

Sum of AP using first and last terms is given by

36 × 2 = n (1 + 11)

n = 6