Probability Tes...

Two cards are drawn from a pack. The probability of getting a king and a queen is

Tickets numbered from 1 to 20 are mixed up together and then a ticket is drawn at random. What is the probability that the drawn ticket has a number which is a multiple of 3 or 7?

A bag contains 6 black, 9 white and 5 red balls. Three balls are drawn at random. What is the probability that the balls drawn are black?

A pair of dice is thrown and the numbers appearing have sum greater than or equal to 10. The probability of getting a sum of 10 is

In a collection of 6 Mathematics and 4 Physics books, the probability that 3 particular Mathematics books will be together, is

Three identical dice are rolled. The probability that the same number will appear on each of them is

Mean number of ' sixes' in four throws of a fair dice is

A coin is tossed once. If a head comes up , then it is tossed again and if a tail comes up , a dice is thrown . The number of points in the sample space of experiment is

Five letters are sent to different persons and addresses on the five envelopes are written at random. The probability that all the letters reach the correct destiny is