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    Professor

    Complete the series: 11, 29, 55, ?, 131 :

    1. 81,
    2. 110
    3. 78
    4. 89
    1 Answers
    Professor

    Answer: (4) 89

    Explanation:-

    The square of 3 + 2 x 1 = 9 + 2 = 11,
    The square of 5 + 2 x 2 = 25 + 4 = 29,
    The  square of 7 + 2 x 3 = 49 + 6 = 55,
    The  square of 9 + 2 x 4 = 81 + 8 = 89
    The square of 11 + 2 x 5 = 121 + 10 = 131

    Hence, the answer is (4) 89.

    Answered by Anurag Mishra on 15th December 2015..