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Question

Find the next number in the sequence.

21, 9, 21, 11, 21, 13, 21, __


  1. 16

  2. 15

  3. 14

  4. 17

  5. None of these.


Solution

The correct option is B

15


In this alternating repetition series, the random number 21 is interpolated after every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.

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