Question 30

In this question, one term in number series is incorrect. Find out the incorrect number.
56, 72, 90, 110, 132, 139

Solution

56, 72, 90, 110, 132, 139

Difference b/w 2nd and 1st terms = 72-56 = 16
Difference b/w 3rd and 2nd terms = 90-72 = 18
Difference b/w 4th and 3rd terms = 110-90 = 20
Difference b/w 5th and 4th terms = 132-110 = 22
Difference b/w 6th and 5th term = 139-132 = 7

The odd one is the last term, because it is expected to become 132 + 24 = 156.
Therefore, 139 is the wrong term in the sequence.

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