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Verified answer
Materi Barisan1/2, 1, 2, 4, 8 merupakan barisan geometri dgn a = 1/2 dan r = 2/1 = 4/2 = 8/4 = 2.
Rumus umum barisan geometri adalah
Un = ar^(n-1) = 1/2 × 2^(n-1) = 2^(-1) × 2^(n-1)
= 2^(n-2) (Jawaban D)