Question
17 21 51 169 701
? What should come in place of question mark ‘?’ in the following number series?Solution
17 × 1 + 4 = 21 21 × 2 + 9 = 51 51 × 3 + 16 = 169 169 × 4 + 25 = 701 701 × 5 + 36 = 3541
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