SOLUTION: Suppose that 5 thank-you notes are written and 5 envelopes are addressed. Accidentales, the notes are randomly inserted into the envelopes and mailed without checking the addressed

Question 1131153: Suppose that 5 thank-you notes are written and 5 envelopes are addressed. Accidentales, the notes are randomly inserted into the envelopes and mailed without checking the addressed. What is the probability that all the notes will be inserted into the correcto envelopes? Leave the probability as a fraction. Do not simplify the fraction.
Answer by ikleyn(52788) (Show Source): You can put this solution on YOUR website!
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The number of all possible permutations of 5 notes (= the number of all possible outcomes) is  5! = 5*4*3*2*1 = 120.


Of them, only one is matching.


So the probability under the question is  .

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