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The results of students of a college rev...

The results of students of a college revealed the following facts. 25% of students failed in Mathematics, 15% of students failed in Chemistry,10% of students failed in both. If a student is selected at random. The probability that he has failed in Mathematics, given that he failed in Chemistry is (i)`1/5` (ii)`2/3` (iii)`3/5` (iv)`1/3`

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