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In the following number series only one number is wrong. Find out the wrong number. 4 6 18 49 201 1011

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In the following number series only one number is wrong. Find out the wrong number.

 4 6 18 49 201 1011

 (a) 1011 (b) 201 (c) 18 (d) 49 (e) None of these
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(c) The series is
× 1 + 2, × 2 + 3, × 3 + 4, × 4 + 5, × 5 + 6
The wrong number is 18.
It should be 6 × 2 + 3 = 15

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