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    There are total 36 outcomes (6 * 6).

    Out of 36, following outcomes are having sum greater than 9. So we don't count them:

    {4, 6}, {5, 5}, {5, 6}, {6, 4}, {6, 5}, {6, 6}.

    So we are left with 36 - 6 = 30. (outcomes having sum AT MOST 9)

    The answer is: 30/36 = 5/6.