Odd Man Out and Series
 4  8, 16  32, 64  (...) :

 128
 128
 192
 192

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Each number is the preceding number multiplied by  2. So, the required number is  128.
Correct Option: B
Each number is the preceding number multiplied by  2. So, the required number is  128.
 125, 123, 120, 115, 108, 100, 84 ?

 125
 115
 100
 84

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Prime numbers 2, 3, 5, 7, 11, 13 have successively been subtracted. So, 100 is wrong. It must be (108  11) i.e., 97.
Correct Option: C
Prime numbers 2, 3, 5, 7, 11, 13 have successively been subtracted. So, 100 is wrong. It must be (108  11) i.e., 97.
 125, 127, 130, 135, 142, 153, 165 ?

 130
 142
 153
 165

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Prime number 2, 3, 5, 7, 11, 13 are to be added successively. So, 165 is wrong.
Correct Option: D
Prime number 2, 3, 5, 7, 11, 13 are to be added successively. So, 165 is wrong.
 52, 51, 48, 43, 34, 27, 16 ?

 27
 34
 43
 48

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Subtract 1, 3, 5, 7, 9, 11 from successive numbers. So, 34 is wrong.
Correct Option: B
Subtract 1, 3, 5, 7, 9, 11 from successive numbers. So, 34 is wrong.
 Find the wrong number in the series 3, 8, 15, 24, 34, 48, 63 ?

 15
 24
 34
 48

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The difference between consecutive terms are respectively. 5, 7, 9, 11 and 13. So, 34 is a wrong number.
Correct Option: C
The difference between consecutive terms are respectively. 5, 7, 9, 11 and 13. So, 34 is a wrong number.