Solution:
The AP is 5, 12, 19,… to 50 terms
Here, a = 5, d = 12 – 5 = 7, n = 50
An AP 5, 12, 19, …. has 50 term. Find its last term. Hence, find the sum of its last 15 terms.
An AP 5, 12, 19, …. has 50 term. Find its last term. Hence, find the sum of its last 15 terms.