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. Select the correct answer from above options

Answer 1

`P(M) = (40x)/(100x) = 0.4` `P(B) = 30/100 = 0.3` `P(M nn B) = 10% = 0.1` `P(M uu B) = ?` so, `P(M uu B) = P(M) + P(B) - P(M nn B)` `= 0.4+0.3-0.1` `=0.6 = 60%` answer