Question 30

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

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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