Question

Imagine that you have 10 CDs and 10 envelopes on a table before you; each CD and each envelope are labelled with a number such as 7 or 10. If you randomly put the CDs into the envelopes provided, what is the probability of matching only one CD into the wrong envelope?
It took me a few minutes to realize this is a trick question. It is impossible to have exactly one CD in the wrong envelope. If a CD is in the wrong envelope, then there must be at least one other CD in a wrong envelope. So, the probability is zero.

Related Questions

Prize winners for a giveaway program are to be determined as follows: Envelopes for the first 500 en... In an assorted pack of 16 envelopes, there are 10 white envelopes, 3 blue envelopes, and 3 grey enve... Ann is addressing envelopes for her wedding invitations. This graph shows how many envelopes she has... Hadley has 36 of a box of white envelopes and 13 of a box of gray envelopes. When full, each...