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.

In an examination.30% of students failed in Maths,20% of students failed in Chemistry and 10% of students failed in both Maths & Chemistry.A student is selected at random.Find the probability that (i) The student has failed in Maths.

In an examination.30% of students failed in Maths,20% of students failed in Chemistry and 10% of students failed in both Maths & Chemistry.A student is selected at random.Find the probability that (ii) The student has failed in Chemistry

In a hostel 50% of the girls like tea, 40% like coffee and 20% like both tea and coffee.A girl is selected at random.If the girl likes tea,then find the probability that she likes coffee.

In an examination.30% of students failed in Maths,20% of students failed in Chemistry and 10% of students failed in both Maths & Chemistry.A student is selected at random.Find the probability that the student has failed in Maths,it is known that he has failed in Chemistry.

In a class of 60 students, 30 opted for NCC, 32 opted for NSS and 24 opted for both NCC and NSS. If one of these students is selected at random, find: the probability that the student has opted for exactly one of NCC or NSS.

In class10A,there are 30 boys and 20 girls. In10B, there are 15boys and 25 girls. One student is to be selected from each class.What is the probability of both being boys?

In a ladies hostel,60% of the students read Hindi newspaper,40% read English newspaper and 20%read both Hindi and English newspapers.A student is selected at random. If she reads English newspaper,find the probability that she reads Hindi newspaper.

In a ladies hostel,60% of the students read Hindi newspaper,40% read English newspaper and 20%read both Hindi and English newspapers.A student is selected at random. If she reads Hindi newspaper,find the probability that she reads English newspaper.

In class10A,there are 30 boys and 20 girls. In10B, there are 15boys and 25 girls. One student is to be selected from each class.What is the probability of atleast one boy?

In a hostel 50% of the girls like tea, 40% like coffee and 20% like both tea and coffee A girl is selected at random. Find the probability that she likes neither tea or coffee .