"In a weekly lottery, a player selects six different numbers from 1 to 40. Determine the number of possible lottery tickets." I answered 40 * 39 * 38 * 37 * 36 * 35 = 2,763,633,600. The book says 3,838,380. If the book is right, why?
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Order doesn't matter, so C(40,6)=3838380
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