Question
21, 22, 48, 153, 628,
? What should come in place of question mark (?) in the following number series?Solution
21 × 1 + 12 = 22 22× 2 + 22 = 48 48 × 3 + 32 = 153 153 × 4 + 42 = 628 628 × 5 + 52 = 3165
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