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-After the typist writes 12 letters and addresses 12 envelopes, she
inserts the letters randomly into the envelopes (1 letter per envelope).
What is the probability that exactly 1 letter is inserted in an improper
envelope?

Read Solution (Total 1)

Answer is '0'(ZERO)
Explanation:Logic is simple;if there is a letter in the wrong envelope;then there will also be another wrong adressed envelope;No of wrong addressed envelopes can only be even:so the chance for 'Exacly 1' is '0'
13 years agoHelpfull: Yes(3) No(0)

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