The Diciest Challenge

Discrete Mathematics Level 5

We know that when rolling two standard 6-sided dice, each numbered 1 to 6, we can roll a sum of 2 with a chance of \(\frac1{36} \), roll a sum of 3 with a chance of \( \frac2{36} \), ... , and roll a sum of 12 with a chance of \( \frac1{36} \).

Now you are given two blank 6-sided fair dices; prove that there is one other way to label the two dice with not necessarily distinct positive integers of your choice in such a way that we get the exact same probability for each sum as when rolling the two standard 6-sided dice shown above.

Let the numbers on the faces of the first dice be denoted as \( a_1, a_2, a_3, a_4, a_5, a_6\), where \(a_1 \leq a_2 \leq a_3 \leq a_4 \leq a_5 \leq a_6 \).

Similarly, let the numbers on the faces of the second dice be denoted as \( b_1, b_2, b_3, b_4, b_5, b_6\), where \(b_1 \leq b_2 \leq b_3 \leq b_4 \leq b_5 \leq b_6 \) and \(a_6 < b_6\).

Submit your answer the concatenation of these 12 digits, \(\overline{a_1 a_2 a_3 a_4 a_5 a_6 b_1 b_2 b_3 b_4 b_5 b_6 } \).

For example, if the respective faces of the two dices that you've found are \((2,3,3,6,6,7)\) and \((1,4,5,6,6,9) \), submit your answer as 233667145669.


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