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U6=ar^5= 384
384/48 = ar^5/ar^2
8=r^3, maka r = 2
a.r^2
a(2)^2 =48
a(4) = 48
a= 12
Sn= a(r^n - 1)/(r-1)
S5 = 12(2^5 - 1)/ (2-1)
S5 = 12(32-1) / 1
S5 = 12(31) /1
S5 = 372/1
S5 = 372
jawabannya C