Arranging coloured billiard balls

In how many ways can 17 billiard balls be arranged in a line if 7 are black, 6 are red, and 4 are white?

~4 minAnswer checked instantlymultinomial coefficient

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XI. Permutations and Combinations, Examples XI.b, No. 2

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