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S10 = 33(S5)
a (r^10 - 1) : (r -1) = 33 a (r^5 - 1) : (r-1) )
r^10 - 1 = 33 (r^5 -1)
(r^5 -1) (r^5 + 1) = 33 (r^5 - 1)
r^5 + 1 = 33
r^5 = 32
r (rasio) =2
u6 = ar^5 = 2 x 32
= 64