Question
20 9 10 ? 29 71.5
What should come in place of the question mark (?) in the following number series?Solution
20 × 0.5 – 1 = 9 9 × 1 + 1 = 10 10 × 1.5 – 1 = 14 14 × 2 + 1 = 29 29 × 2.5 – 1 = 71.5
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