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ar^4 = 48 dan ar^8 = 768
ar^8 = 768
ar^4 48
r^4 = 16 = (2)^4 maka r = 2
ar^4 = 48
a =48/16 = 3
U7 = ar^6
= 3(2)^6
= 3(64)
= 192
Jadi, U1 = a = 3 dan U7 = 192