There are 60 students in a class, out of which 40 opt for NCC, 30 opt for NSS and 20 for both, then the probability that a student has opted for none of the NCC or NSS is (A) `5/6` (B) `1/6` (C) `1/3` (D) `1/2`

There are 60% students in Maths and 30% in Biology. If 10% students are in both subjects. Find the probability that a randomly selected student has Maths or Biology.

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

In a class of 60 students, 40 opted for NCC, 30 opted for NSS and 20 opted for both NCC and NSS. If one of these students is selected at random, then the probability that the student selected has opted neither for NCC nor for NSS is

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(i) The student opted for NCC or NSS.(ii) The student has opted neither NCC nor NSS.(iii) The student has opted NSS but not NCC.

A class has 20 girls and 16 boys. One student is selected at random. Find the probability that the student is a girl.

100 students appeared for two examinations .60 passed the first , 50 passed the second and 30 passed both . Find the probability that a student selected at random has failed in both examinations .

The mean age of 40 students is 16 years and the mean age of another group of 60 students is 20 years. Find out the mean age of all the 100 students combined together.

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. (i) Find the probability that student opted for NCC or NSS. (ii) Probability that the student has opted neither NCC nor NSS.

In a class of 125 students 70 passed in Mathematics, 55 in statistics, and 30 in both. Then find the probability that a student selected at random from the class has passed in only one subject.

In a class of 125 students 70 passed in Mathematics, 55 in statistics, and 30 in both. Then find the probability that a student selected at random from the class has passes in only one subject.