Question

Jumlah 5 suku pertama suatu barisan geometri adalh 93 . jika rasio barisan tersebut adalh 2 maka suku ke 6 barisan tersebut adalh
a . 48
b . 60
c . 96
d , 100

Answer 1

S5 = a (r^5 - 1) / (r-1)
93 = a (2^5 - 1) / (2 - 1)
93 = a (32 - 1)
93 = a (31)
a = 3
U6 = ar^5 = 3 (2)^5 = 3 (32) = 96    (C)