One student is selected at random.
Let P(A) be the probability of students passing in English.
Let P(B) be the probability of students passing in Hindi.
∴P(B)=
4
5
Let P(A ∩ B) be the probability of students passing in both English and Hindi.
∴P(A∩B)=
1
2
Tip – By conditional probability, P(A/B) =
P(A∩B)
P(B)
where P(A/B) is the probability of occurrence of the event
A given that B has already occurred.
The probability that he will pass in English given that he passes in Hindi: