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7 + S~genap = 6
S~genap = 6 - 7 = -1
r = S~genap/S~ganjil = -1/7
a/(1 - r) = S~
a/(1 - (-1/7)) = 6
a/(1+1/7) = 6
a = 6(1+1/7) = 6(8/7) = 48/7
U6 = ar^5 = 48/7 (-1/7)^5 = 48/7 * (-1/7^5) = - 48/7^6