Question

a soma dos 120 termos da pa 3 5 7

Answer 1

a1 = 3
a2 = 5
n = 120
r = 5 - 3 = 2 ****
a120 = 3 + 119(2)
a120 = 3 + 238 = 241 ****

S120 = ( 3 + 241 )60
S120 = 244 * 60 = 14640 ***