Mathmetics

ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

Q21.
Find the odd man out in the following number series.

8,   27,   64,   100,    125,  216,   343
1) 27 2) 100
3) 125 4) 343
5)None of these
Answer : 100
Explanation : The pattern is 23, 33, 43, 53, 63, 73.  But, 100 is not a perfect cube.
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Q22.
Find the odd man out in the following number series.

3,   5,   11,   14,   17,   21
1) 21 2) 17
3) 11 4) 14
5)None of these
Answer : 14
Explanation :
Each of the numbers except 14 is an odd number.
The number '14' is the only even number.
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