Any 5 from 9 = (9 x 8 x 7 x 6)/(4 x 3 x 2) = 126
Any 5 in any order = 5 x 4 x 3 x 2 = 120
Answer: 126 x 120 = 15120
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Because with replacement, the total number of possible outcomes - the denominator of the probability ratio - remains the same. Without replacement the number of possible outcomes becomes smaller.
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