What will come in place of the question mark (?) in the following number series ?
3, ?, 14, 55, 274, 1643
Let the missing number be y
here the pattern is
55 = 14x4 -1
274 = 55x5 -1
1643 = 274 x 6 -1
so
y = 3 x 2 - 1 = 5
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