Answers

2016-06-28T19:04:48+08:00
A₁ = 4    r= 3

sn = a₁(1-rⁿ)/1-r
sn = 4 (1-3⁵)/1-3
sn = 4 (1-243)/-2
sn= 4 (-242)/-2
sn = -968/-2
sn = 484
1 1 1