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U6=3r^6-1
96=3r^5
r^5= 32
r=2
Sn= a(r^n-1)/r-1
S6=3(2^6 -1)/2-1
S6= 3(63)/1
S6= 189 (B)
tali terpanjang = U6 = 96
U6 = a.
96 = 3.
32 =
r = 2
panjang tali semula :
Sn =
S6 =
S6 =
S6 = 63 . 3
S6 = 189