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    Question

    Identify the number that does NOT belong to the

    following series. 3, 7, 12, 21, 57, 109, 276, 499
    A 57 Correct Answer Incorrect Answer
    B 276 Correct Answer Incorrect Answer
    C 109 Correct Answer Incorrect Answer
    D 499 Correct Answer Incorrect Answer

    Solution

    Seies  = 3, 7, 12, 21, 57, 109, 276, 499 Logic : the series is based on double difference Pattern: First difference is cube of numbers and it is in alternate places  Second difference is of square of  the numbers and it is in alternate places as well. Series of difference = 4, 5, 9, 36, 52, 167 , 223. Series of double difference = 1, 4, 27, 16, 115 , 56. Instead of 115, 125 will be placed.  

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