1.

What should come in place of the question mark (?) in the following number series?3 4 12 45 ? 1005

Answer»

The series is as follows starting from second number

x × 1 + 12 , x × 2 + 22, x ×3 + 32, x × 4 + 42, x ×5 +52

(x denotes the previous number in the series)
? = x × 4 + 42 = 45 × 4 + 16 = 196



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