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    Question

    Find the missing term: 2, 6, 15, 31, 56,

    ?
    A 79 Correct Answer Incorrect Answer
    B 92 Correct Answer Incorrect Answer
    C 84 Correct Answer Incorrect Answer
    D 69 Correct Answer Incorrect Answer

    Solution

    Look at differences: 6 โˆ’ 2 = 4 = 2ยฒ 15 โˆ’ 6 = 9 = 3ยฒ 31 โˆ’ 15 = 16 = 4ยฒ 56 โˆ’ 31 = 25 = 5ยฒ Differences are squares of 2, 3, 4, 5, โ€ฆ Next difference = 6ยฒ = 36 Missing term = 56 + 36 = 92.

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