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A girl is preparing for National Level E...

A girl is preparing for National Level Entrance exam and State Level Entrance exam for professional courses. The chances of her cracking National Level exam is 0.42 and that of State Level exam is 0.54. The probability that she clears both the exams is 0.11. Find the probability that: she cracks at least one of the two exam.

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A girl is preparing for National Level Entrance exam and State Level Entrance exam for professional courses. The chances of her cracking National Level exam is 0.42 and that of State Level exam is 0.54. The probability that she clears both the exams is 0.11.Find the probabilty that : she cracks none.

A girl is preparing for National Level Entrance exam and State Level Entrance exam for professional courses. The chances of her cracking National Level exam is 0.42 and that of State Level exam is 0.54. The probability that she clears both the exams is 0.11.Find the probabilty that : she cracks only one of the two.

The probability of passing in an exam for Ramesh, Jay, Sunil are (3)/(7),0.78 and 66%. Who has least probability of passing ?