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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

In following number series, two terms have been put within brackets. Choose the appropriate option

Find the wrong number in the series :7, 28, 63, 124, 215, 342, 511

Option:
A. 7
B. 28
C. 124
D. 215
E. 342
Answer: B . 28

Justification:

Clearly, the correct sequence is
(23 - 1), (33 - 1), (43 - 1), (53 - 1), (63 - 1), (73 - 1), (83 - 1).
.'. 28 is wrong and should be replaced by (33 - 1) i.e. 26.
Hence, the answer is (b).

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