Question

Find the sum of the first 20 terms of the Arithmetic Progression where a = 5 and t20 = 62

Answer 1

Answer:

06-Apr-2019 · 6 answers

a1, a1+n, a1+2n,…a1+ 19n. a1=5, 5+19n=62 n=3 Sum= 20*a1 + 3 *19*20/2 = 60+570 = 630.