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 green and two are blue?

Two cards are drawn from a pack of 52 cards. The probability that one is a spade and one is a heart, is

An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If two marbles are drawn at random from the urn, what is the probability that both are red?

An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If two marbles are picked up at random, what is the probability that either both are green or both are yellow?

A box contains 10 black and 10 white balls. What is the probability of drawing 2 balls of the same colour?

A basket contains 4 red, 5 blue and 3 green marbles. If 2 marbles are drawn at random from the basket, what is the probability that both are red?

Three unbiased coins are tossed. What is the probability of getting at least 2 heads?

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

In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?

An urn contains 3 red, 3 green and 2 blue balls. If 2 balls are drawn at random, find the probability that no ball is blue.

Two dice are tossed. The probability that the total score is a prime number is