Arthur D. answered 12/12/17
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4C3 means how many ways can you choose 3 jacks from a total of 4 jacks
48C2 means how many ways can you choose the other 2 cards, to go with the 3 jacks, from a total of 48 cards left after eliminating the 4 jacks; remember you have hands consisting of 5 cards, 3 of which are jacks