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n = 6
a = 3 cm
u6 = 96 cm
u6 = a . r^5
96 = 3 . r^5
32 = r^5
2^5 = r^5
r = 5
panjang tali mula-mula = s6
s6 = a (r^6 -1) / (r-1)
s6 = 3 (2^6 -1) / (2-1)
s6 = 3 (64-1) / (1)
s6 = 189
jadi panjang tali mula-mula adalah 189 cm