In a group of students, 100 students know Hindi, 50 know English and 25 know both. Each of the students knows either Hindi or English. How many students are there in the group?

In how many ways can 8 students be arranged in a row?

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

10 students compete in a race. In how many ways first two prizes be given?

In a class of 60 students 40 passed in English, 35 failed in Mathematics. How many students passed both in English and Mathematics.

In a hostel, 60% of the students read Hindi newspaper, 40% read English news, paper and 20% read both Hindi and English newspapers. A student is selected at random. i. Find the probability that she reads neither Hindi nor English nespapers. ii. If she reads Hindi newspaper, find the probability that she reads English newspaper. iii. If she reads English newspaper, find the probability that she reads Hindi newspaper.

In a survey conduced on 800 students of a school , 250 students were found to like tea and 300 like coffee , 150 like both tea and coffee .Find how many students like neither tea nor coffee ?