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

A bag contains 6 red balls 11 yellow balls and 5 pink balls. If two balls are drawn at random from the bag. One after an…

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

A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If four marbles are picked at random, what i…

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

A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that al…

The probability of success changes from trial to trial in

Suresh keeps all his socks in a single drawer. He has 24 pairs of white socks and 18 pairs of grey socks. Suresh picks 3…