Question
17, 9, ?, 13.5, 25,
65Solution
17 × 0.5 + 0.5 = 9 9 × 1 - 1 = 8 8 × 1.5 + 1.5 = 13.5 13.5 × 2 – 2 = 25 25 × 2.5 + 2.5 = 65
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