Question
19   20   42   129   ?    2605Â
 .  What should come in place of the question mark (?) in the following number series?Solution
19 × 1 + 1 = 20 20 × 2 + 2 = 42 42 × 3 + 3 = 129 129 × 4 + 4 = 520 520 × 5 + 5 = 2605
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