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Give a combinatorial proof of the following identity. Hint: Suppose you have 5 red pens, 1 green pen, and 4 blue pens. (OO = O)

Give a combinatorial proof of the following identity. Hint: Suppose you have 5 red pens, 1 green pen, and 4 blue pens.

(OO = O) 10 5. 4

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