Question

The first term of an Arithmetic progression is 3and the last term is 9, find the number of terms in the progression if the common difference is 3/2​

Answer 1

n = 5 terms

Explanation:

An = a1 + (n-1)d

9 = 3 + (n-1) 3/2

9 = 3 + 3/2n - 3/2

9 = 3/2 + 3/2n

9 - 3/2 = 3/2n

(15/2) / (3/2) = n

30/6 = n