Saturday, August 28, 2010

Do it!: Classic Conundrums

Clive was wrapping gifts, one for each of his ten grandchildren. After carefully wrapping each gift, Clive realized he couldn't remember which gift was for whom. Not wanting to make more work for himself, he simply stuck ten labels on the gifts at random. What is the likelihood of exactly nine out of ten of his grandchildren receiving the correct gift?
It would be impossible. If nine out of ten grandchildren have the correct gift, all ten grandchildren must have the correct gift.

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