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11.3.81 Q22 In a certain​ four-engine vintage​ aircraft, now quite​ unreliable, each engine has a 12​%...

11.3.81 Q22 In a certain​ four-engine vintage​ aircraft, now quite​ unreliable, each engine has a 12​% chance of failure on any​ flight, as long as it is carrying its​ one-fourth share of the load. But if one engine​ fails, then the chance of failure increases to 24​% for each of the other three engines. And if a second engine​ fails, each of the remaining two has a 36​% chance of failure. Assuming that no two engines ever fail​ simultaneously, and that the aircraft can continue flying with as few as two operating​ engines, find the probability for exactly two engine failures​ (any two of four​ engines).

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