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U5 = ar^4 = 512
a. mencari rasio
U5 / U3
ar^4 / ar^2 = 512 / 32
r^2 = 16
r^2 = (4)^2
r = 4
b. U1 = a
disubtitusikan ke salah 1 suku, suku ke 3 atau suku 5
misal U3
ar^2 = 32
a (4)^2 = 32
a 16 = 32
a = 32 / 16
a = 2 jadi suku pertama adalah 2
c. jumlah suku ke enam = S6
S6 = a (r^6 - 1) / (r - 1)
= 2 (4^6 - 1) / (4 - 1)
= 2 ( 4096 - 1) / 3
= 2 (4095) / 3
= 8190 / 3
= 2730