In an examination 30%, 35% and 45% failed in statistics, in mathematics and in at least one of the subjects respectively. An examinee is selected at random. Find the probabilities that (a) he failed in mathematics only (b) he passed in statistics if it is known that he failed in mathematics.
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a. 0.65
b.0.1
these are probabilities
b.0.1
these are probabilities
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