Q. 133.9( 16 Votes )

In a class, 40% s

Answer :


Let P(A) be the probability of students studying mathematics.


P(A)=0.40


Let P(B) be the probability of students studying biology.


P(B)=0.25


Let be the probability of students studying both mathematics and biology.


P(AB)=0.15


One student is selected at random.


Tip – By conditional probability, where is the probability of occurrence of the event A given that B has already occurred.


(i)The probability that he studies mathematics given that he studies biology:






(ii)The probability that he studies biology given that he studies mathematics:






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