The first term of an AP is 5, the last term is 45 and the sum is 400 Find - Maths - Arithmetic Progressions

Question

The first term of an AP is 5, the last term is 45 and the sum is
400 Find the number of terms and the common difference

Gopal Mohanty · Accepted Answer

Given that, a = 5 l = 45 Sn = 400

n = 16 l = a + (n − 1) d 45 = 5 + (16 − 1) d 40 = 15d

The first term of an AP is 5, the last term is 45 and the sum is 400. Find the number of terms and the common difference.