Contestants A, B, C, D, E, and F are in a 10K race. How many different ways can a race with 6 runners be completed? (Assume there is no tie.) In how many ways can D finish first and E finish second? What is the probability that D finishes first and E finishes second? Enter a reduced fraction or decimal.

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A: P(X=4)=0.116, P(X=5)=0.144, P(X=6)=0.283,

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