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U4 = 54
U6 = 486
Ditanya :
a. Rasio
b. U1 = a
Dijawab :
U6/U4 = 486/54
a.r^5/a.r^3 = 9
r^2 = 9
r = 3
Jadi Rasio nya adalah 3
U4 = 54
a.r^3 = 54
a.3^3 = 54
a.27 = 54
a = 54/27
a = 2
Jadis suku pertamanya dalah 2