Even Face Distribution

Combinatorics
Multinomial
Medium
A fair six-sided die is rolled 36 times. What is the probability that every face appears exactly six times?
Hint 1

Count sequences using the multinomial coefficient, then divide by total sequences.

Hint 2

There are equally likely sequences of rolls.

Show worked solution
  1. 1. Count favorable sequences

    Number of sequences where each face appears exactly 6 times is the multinomial coefficient .

  2. 2. Total sequences

    Total possible sequences of 36 rolls is .

  3. 3. Probability

    Divide favorable by total.

Answer: 36! / ((6!)^6 * 6^36)

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