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Discussion :: Number Series

  1. Find the missing term: 20, 20, 19, 16, 17, 13, 14, 11, ?, ?

    2. A.

     10, 10
    B.

     10, 11
    C.

     13, 14
    D.

     13, 16

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    Answer : Option A

    Explanation :

    Let the missing terms of the series be x1 and x2.
    Thus, the sequence 20, 20, 19, 16, 17, 13, 14, 11. x1, x2 is a combination of two series:
    I. 20, 19, 17, 14, x1 and
    II. 20, 16, 13, 11, x2
    The pattern in I is - 1, - 2, - 3,..............So, missing term, x1= 14 - 4 = 10
    The pattern in II is - 4, - 3, - 2,.......... So,missing term, x2 = 11 - 1 = 10

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