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ar^5 = 729
_________ :
1/r^2 = 8/729
r^2 = 729/8
r = √(729/8)
ga bulet hasilnya
b) ar = 6
ar^4 = 162
_________ :
1/r^3 = 6/162
r^3 = 162/6 = 27
r = 3
a = 2
c) ar^2 = 10
ar^5 = 5/4
___________ :
1/r^3 = 8
r^3 = 1/8
r = 1/2
a = 40