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Question: a postal employee has 2 letters to deliver to 2...

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A postal employee has 2 letters to deliver to 2 different homes, but randomly delivers the letters on a block with three houses. What is the probability that:

(a) Exactly one of the letters will be delivered properly?

(b) Both letters will be delivered properly?

(c) None of the letters will be delivered properly?

(d) At least one of the letters will be delivered properly?

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