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[Solution Library] A box of 21 keys contains four that will unlock a building’s main entrance. Assuming all the keys are unlabeled and almost identical

Question: A box of 21 keys contains four that will unlock a building’s main entrance.  Assuming all the keys are unlabeled and almost identical in appearance, what is the probability that if two keys are selected without replacement that the first key does not unlock the building’s main entrance and the second key does unlock it?

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Solution: The downloadable solution consists of 1 pages
Deliverable: Word Document


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