Instructions

What will come in place of the question mark (?) in the following number series ?

Question 149

3, ?, 14, 55, 274, 1643

Solution

Let the missing number be y

here the pattern is

55 = 14x4 -1

274 = 55x5 -1

1643 = 274 x 6 -1

y = 3 x 2 - 1 = 5

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