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