Homework Help: probability

Posted by hhhh on Wednesday, October 27, 2010 at 12:32am.

among the exames in the examination 30%, 35% & 45% failed in statistics, in maths, & in atleast one of the subjects respectively. one student is selected at random. find the probability that: (a)he has failed in maths, (b)he passed in statistiics if it is known that he has failed in maths

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