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Page 1

\text{则 } P(X=0)=\frac{C_5^0C_4^3}{C_9^3}=\frac{4}{84}=\frac{1}{21}, P(X=1)=\frac{C_5^1C_4^2}{C_9^3}=\frac{30}{84}=\frac{5}{14}, P(X=2)=\frac{C_5^2C_4^1}{C_9^3}=\frac{40}{84}=\frac{10}{21}, P(X=3)=\frac{C_5^3C_4^0}{C_9^3}=\frac{10}{84}=\frac{5}{42}, 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