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I got this two problems, I can't figure them out...
A bookshelf contains m different books and n copies of each. How many different selections can be made from them?
and
In how many different ways can four letters be posted in four envelopes so that no one receives the correct letter?
A bookshelf contains m different books and n copies of each. How many different selections can be made from them?
and
In how many different ways can four letters be posted in four envelopes so that no one receives the correct letter?