(a) If someone has 10 left shoes and 9 right shoes and does not care whether they match, how many “pairs” of shoes can this person select?
(b) A standard deck of cards consists of 52 cards with four suits (spades, hearts, clubs, and diamonds), and each suit has 1 card of each of 13 ranks (2, 3, 4, . . . , 10, J, Q, K, A). How many ways are there to select 4 cards, with one card of each suit?
(c) How many ways are there to select 13 cards, with 1 card of each rank?
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