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27 January, 01:13

If 2 = 6, 3 = 12, 4 = 20, 5 = 30, 6 = 42 then 9 = ?

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  1. 27 January, 01:36
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    2 * 3 = 6

    3 * 4 = 12

    4 * 5 = 20

    5 * 6 = 30

    6 * 7 = 42

    7 * 8 = 56

    8 * 9 = 72

    9 * 10 = 90

    The answer is 90 because I notice that in each number it is multiplied by a number that is increased by 1 in order to make sure it is equal.
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