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Question

In a steamer there are stalls for 12 animals, and there are cows, horses, and calves (not less than 12 of each) ready to be shipped; in how many ways can the shipload be made?

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Solution

The number of arrangements of n things (each consisting a valid amount ) into r things is nr
3 animals arranged over 12 stalls in 312 ways
i.e. 531441 no. of ways.

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