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What should come in place of the question mark (?) in the following number series? 1 3 9 31 ? 651 (a) 97 (b) 127 (c) 129 (d) 109 (e) None of these

Answer» (c) The series is as follows × 1 + 2, × 2 + 3, × 3 + 4, ...


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