In a drawer there are 4 white socks, 3 blue socks and 5 grey socks. Two socks are picked randomly. What is the possibili…

P and Q sit in a ring arrangement with 10 persons. What is the probability that P and Q will sit together?

One card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is a face card (Jack, Q…

For a random variable X, E(X) is

Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even ?

Two dice are thrown simultaneously. What is the probability of getting the sum of the face number is at least 10?

In a school, 45% of the students play football, 30% play volleyball and 15% both. If a student is selected at random, th…

A bag contains 3 blue, 2 green and 5 red balls. If four balls are picked at random, what is the probability that two are…