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U6 / U3 = a.r^5 / a.r²
12/ 96 = r³
1/8 = r³
r = ∛(1/8)
r = 1/2
a .r² = 96
a.(1/2)² = 96
1/4 .a = 96
a = 96 . 4
a = 384
Un = a .r^(n - 1)
= 384 .(1/2)^(10-1)
= 384 . (1/2)^9
= 384 / 512
= 3/4 ..... jawaban : C