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b) rasio (r) = 4/3 : 2 = 4/3 × ½ = 4/6 = ⅔
c) suku ke 8
Un=arⁿ-¹
U8=2(⅔)^(8-1)
U8=2(⅔)^7
U8=2(128/2187)
U8=256/2187