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Rolling with the Same Probability

Directions: Fill in the blanks to complete this sentence using the whole numbers 1 through 9, no more than one time each.
Rolling a sum of ___ on two ___-sided dice is the same probability as rolling a sum of ___ on two ___-sided dice.

Hint

Hint

How could we organize the possible values to see this visually?
How many possible answers are there?

Answer

Answer

Thank you to the secondary mathematics teachers from San Marcos Unified School District for these great answers:
Rolling a 9 on two 6-sided dice is the same probability as rolling a 2 on two 3-sided dice.
Rolling a 2 on two 4-sided dice is the same probability as rolling a 5 on two 8-sided dice.
Rolling a 3 (or 7) on two 4-sided dice is the same probability as rolling a 9 on two 8-sided dice.
Finally Robert Gordon found that you get a 0% probability from rolling a 9 on two 1-sided dice which is the same probability as rolling an 8 on two 3-sided dice.

Source: Audrey Mendivil, Daniel Luevanos, and Robert Kaplinsky

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2 comments

  1. Is it possible to construct a 3 sided die?

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