Question

Find the wrong number 3,5,12,39,154,772,4634

Answer 1

Answer:

The wrong number is 154. 

You multiply each number by n + 1, where n is it's current position (3 is n = 1, 5 is n = 2 et al.) 

Then you subtract the resulting number by 3 times the amount you subtracted from the previous number (you subtracted 1 from 6, which you got from multiplying 3 by 2, then you subtract 3 from 15, etc.) 

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Answer 2

The incorrect number in the series is 39.

Given:

The series -

To find:

The incorrect number in the series

Solution:

The given series follows the pattern of multiplication with ascending numbers and addition with the numeral 2.

This can be described as -

3 × 1 +2

= 5

5 × 2 + 2

= 12

12 × 3+2

= 38

38 × 4+ 2

= 154

154 × 5+ 2

= 772

772 × 6+ 2

= 4634

Thus, after the number 12, the next term should be 38 and not 39.

Answer: The incorrect number in the series is 39.

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