#### Question

In Class XI of a school 40% of the students study Mathematics and 30% study Biology. 10% of the class study both Mathematics and Biology. If a student is selected at random from the class, find the probability that he will be studying Mathematics or Biology.

#### Solution

Let A be the event in which the selected student studies Mathematics and B be the event in which the selected student studies Biology.

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Solution In Class XI of a school 40% of the students study Mathematics and 30% study Biology. 10% of the class study both Mathematics and Biology. If a student is selected at random from the class, find the probability that he will be studying Mathematics or Biology. Concept: Probability - Probability of 'Not', 'And' and 'Or' Events.