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a r^5 = 96
3 r^5 = 96
r^5 = 96 :3 = 32
r = 2
rumus =
a ( r^n - 1) /(per) r -1
=3 (2^6 -1) / 2-1
= 3 (64 -1)
= 3 x 63 = 189
maaf kalau salah
90:5=18
6+24+42+60+78+96=306