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mathematics
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In an examination,,60% of the students were pass in 1st attempt and 40%were fail. in next attempt, out of 40% ,80% students was pass and remaing 20% was fail again.in last and 3rd attempt,,out of 20% ,90% of the students were pass and remaining 10% were fail..find the probability of (1) students who finally failed (2) passed in 2nd attempt and (3) passed in 3rd attempt//????

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