FOUR PRACTICE PROBLEMS--PERMUTATIONS AND …

2. Imaginary Lottery Game. Order is important, duplicates are not possible. P(10,5) = 30,240. Formula-free sequential method: the first number has 10 possibilities, the second number has 9, the third number has 8, the fourth number has 7, and the fifth number has 6. 10 x 9 x 8 x 7 x 6 = 30,240. So the probability of winning is 1 / 30,240 = 0 ... ................
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