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Un = a.r^(n - 1)
Maka
U4 = 54 = a.r^3
----------------------
U2 = 6 = a.r
Sehingga :
9 = r^2
r = 3
Maka suku pertama :
6 = a.r
6 = a.3
a = 2
Maka jumlah 5 suku pertama
Sn = a.(r^n - 1)/ (r - 1)
S5 = 2.(3^5 - 1)/ (3 - 1)
S5 = 2.(243 - 1) / 2
S5 = 242