1.

What should come in place of the question mark (?) in the following number series?2 9 30 105 ? 2195

Answer» The series is as follows starting from the second number denote the previous number in the series by x.

x × 1 + 1 × 7, x × 2 + 2 × 6, x × 3 + 3 × 5, x × 4 + 4 × 4, x × 5 + 5× 3
So the missing number ? = 436


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