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    Number Series: Series Pattern

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    I saw a board on a math website that said to solve this if you are genius:

    8=56
    7=42
    6=30
    5=20
    3=?

    I see there are several ways to approach this and I have come up with 9 (my best guess), 6, and 14. What answer is most correct and why? Please provide a detailed explanation.

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    https://brainmass.com/math/logic/number-series-series-pattern-572479

    Solution Preview

    I believe most people will guess the following pattern:
    line 1: 56 = 8*(8-1)
    line 2: 42 = 7*(7-1)
    line 3: 30 = 6*(6-1)
    line 4: 20 = 5*(5-1)

    Then they assume a fifth line: 4=12 (i.e., 12=(4*(4-1)) is omitted.

    The last ...

    Solution Summary

    This solution solves for the pattern of a series of equations.

    $2.19