Three unbiased coins are tossed. What is the probability of getting at most two heads?
What is the probability of getting a sum 9 from two throws of a dice?
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?
A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
Four dice are thrown simultaneously. Find the probability that all of them show the same face.
An urn contains 6 red, 5 blue and 2 green marbles. If 2 marbles are picked at random, what is the probability that both are red?
The chance of throwing 3 or 5 or 11 with two dice is
What is the probability of a leap year to have 53 Fridays?
What is the probability of a ordinary year to have 53 Mondays?