Odd Man Out and Series


  1. 4, 6, 8, 9, 10, 11, 12 ?









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    Each number is a composite number except 11.

    Correct Option: B

    Each number is a composite number except 11.


  1. 105, 85, 60, 30, 0, - 45, - 90 ?









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    Subtract 20, 25, 30, 35, 40, 45 from successive numbers. So 0 is wrong.

    Correct Option: A

    Subtract 20, 25, 30, 35, 40, 45 from successive numbers. So 0 is wrong.



  1. 8, 7, 11, 12, 14, 17, 17, 22, (...) ?









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    There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22). Increasing by 3 and 5 respectively.

    Correct Option: B

    There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22). Increasing by 3 and 5 respectively.


  1. 8, 24, 12, 36, 18, 54, (...) ?









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    Number are alternately multiplied by 3 and divided by 2. So, next number = 54 / 2 = 27.

    Correct Option: A

    Number are alternately multiplied by 3 and divided by 2. So, next number = 54 / 2 = 27.



  1. 15, 31, 63, 127, 255, (...) ?









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    Each number is double the preceding one plus 1.

    Correct Option: B

    Each number is double the preceding one plus 1. So, the next number is (255 x 2) + 1 = 511.