A key ring contains four office keys that are

A key ring contains four office keys that are

A key ring contains four office keys that are identical in appearance, but only one will open your office door. Suppose you randomly select one key and try it. If it does not ?t, you randomly select one of the three remaining keys. If it does not ?t, you randomly select one of the last two. Each different sequence that could occur in selecting the keys represents one of a set of equiprobable simple events.

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