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6. A car is fitted with four–airbags that were randomly selected from a store holding seven...

6. A car is fitted with four–airbags that were randomly selected from a store holding seven air–bags from manufacturer X and five air–bags from manufacturer Y. The air–bags manufactured by Y have since been recalled. What is the probability that the car is not fitted with any of the air–bags manufactured by Y, assuming all the air–bags have the same probability of selection?

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