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u4 = 48
48 = ar(4-1)
48 = ar³
48 = 6r³
8 = r³
2 = r
S10 = a (r*n - 1 ) / r - 1 {* : pangkat }
= 6 (2*10 - 1 ) / 2 - 1
= 6 ( 1.024 - 1 ) / 1
= 6 ( 1.023 )
= 6.138