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There are 6 different letters and 6 correspondingly addressed envelopes. If the letters are randomly put in the envelopes, what is the probability that exactly 5 letters go into the correctly addressed envelopes

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There are 6 different letters and 6 correspondingly addressed envelopes. If the letters are randomly put in the envelopes, what is the probability that exactly 5 letters go into the correctly addressed envelopes?

(a)

Zero

(b)

1/6

(c)

1/2

(d)

5/6

Answer:

(a)

Explanation

It is impossible to have exactly 5 letters in their correct envelopes; hence the probability is zero.