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ar^3 = 54
Eliminasi
r = 1,5
sn = a (r^n - 1) : r-1
sn = 16 (1,5^4 - 1) : 1,5 -1
sn = 16 (4,0625) : 0,5
sn = 65 : 0,5
sn = 130 cm