How many ways are there to pack six copies of the same book into four identical boxes, where a box contains six books?
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Correct answer: D. 9
Explanation
Identical books into identical boxes = partitions of 6 into at most 4 parts: 6, 5+1, 4+2, 4+1+1, 3+3, 3+2+1, 3+1+1+1, 2+2+2, 2+2+1+1 — 9 ways.
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