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a = 90
r = 1/3
U7 = ?
Un = ar^n-1 ( ^n-1 = pangkat n-1 )
U7 = ar^7-1 = 90 × ( 1/3 )^6 = 90 × 1/729 = 10/81
b. diketahui :
a = 1
r = 1/2
U8 = ?
Un = ar^n-1 (^n-1 = pangkat n-1 )
U8 = 1 × (1/2)^8-1 = 1 × ( 1/2 )^7 = 1/128