Odd Man Out and Series
 125, 123, 120, 115, 108, 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.
 Find the wrong number in the series 3, 8, 15, 24, 34, 48, 63 ?

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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.
 52, 51, 48, 43, 34, 27, 16 ?

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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.
 125, 127, 130, 135, 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.
 2, 4, 12, 48, 240, (...) ?

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Go on multiplying the given numbers by 2, 3, 4, 5, 6. So, the correct next number is 1440.
Correct Option: B
Go on multiplying the given numbers by 2, 3, 4, 5, 6. So, the correct next number is 1440.