In the following series find one number that is wrong:
(A) 3 (B) 13 (C) 37 (D) 86
2,3,13,37,86,167,288
Generally in the series problems, if
we do not find any immediate logic, try out finding the differences of
consecutive numbers:
1,10,24,49,81,121
Except 10 and 24, all others are squares
of odd numbers.
10 and 24 are resulted from the
differences of 3,13 and 13,37 respectively. Here if ‘13’ is replaced with ‘12’,
we get the series of differences of consecutive numbers: 1,9,25,49,81,121, which is perfect one. This is
a series of squares of consecutive odd numbers.
Hence the odd one out of the given
set of numbers is ‘13’
Answer (B)
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