Mathematics, 26.05.2021 05:30 gmedisa08

Joseph, Pedro, Samuel, and David leave their backpacks by the classroom door at the start of class. When the fire alarm rings they rush to leave, each randomly grabbing a backpack on the way out. What is the probability that each boy takes a backpack that is not his own?

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Joseph, Pedro, Samuel, and David leave their backpacks by the classroom door at the start of class....

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