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a. A disgruntled letter carrier has to place ten different letters into seven mail boxes. He...

a. A disgruntled letter carrier has to place ten different letters into seven mail boxes. He pays no attention to the addresses on the letters. In how many ways can he distribute the letters into the boxes?

b. Suppose he has ten identical circulars, instead of the letters, to place. In how many ways can he distribute the circulars?

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