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dik : rasio = 6 = 3
2
U7 = a.r pangkat n-1
= 2 x.3 pankat 6
= 2 x 729
= 1458.
u8 = a. r pangkat n-1
= 2 x 3 pangkat 7
= 2 x 2187
= 4374 jadi, U7 + U8 = 1458 + 4374
= 5832