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5 people are randomly selected and their dominate hand was recorded. Assume each person's dominate hand is independent of the next and P(L)=0.10, P(-L)=0.90 Let

5 people are randomly selected and their dominate hand was recorded. Assume each person's dominate hand is independent of the next and P(L)=0.10, P(-L)=0.90 Let X be the number of people that are left-handed. How many combinations of ways is it possible to have exactly 3 people are left-handed

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