Question

determine a soma dos 10 primeiros termo da pg (1,9,17..)

Answer 1

RAZÃO = 8

(1,8,19,25,33,41,49,57.65,73)

1+8+19+25+33+41+49+57+65+73= 371

Answer 2

S10 = (1 + 73) . 10 / 2
S10 = 74 . 10 /2
S10 = 740/2
S10 = 370