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r = 6/2 = 3
u7...ar^6 = 2 x3^6 = 2 x 729 = 1.458
u8..ar^7 = 2 x 3^7 = 2x 2.187 = 4.374
u7 + u8 = 1.458 + 4.374 = 5.832
Jadi U7 + U8 = 1458 + 4374 = 5832