[計量] pp2-ps-Q1
Tanya prepared 4 different letters to be sent to 4 different addresses. For
each letter, she prepared an envelope with its correct address. If the 4
letters are to be put into the 4 envelopes at random, what is the probability
that only 1 letter will be put into the envelope with its correct address?
(A) 1/24
(B) 1/8
(C) 1/4
(D) 1/3
(E) 3/8
請問這題怎麼算?
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