Question
21 11.5 13 ? 45.5
116.75 What should come in place of the question mark (?) in the following number series?Solution
21 × 0.5 + 1 = 11.5 11.5 × 1 + 1.5 = 13 13 × 1.5 + 2 = 21.5 21.5 × 2 + 2.5 = 45.5 45.5 × 2.5 + 3 = 116.75
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