60 shirts of different colours are on sale. If one shirt is chosen at random
what is the probability that it is red ?

60 shirts of different colours are on sale. If one shirt is chosen at random what is the probability that it is plain and extra-large ?

60 shirts of different colours are on sale. If one shirt is chosen at random what is the probability that it is small, given that it is blue ?

60 shirts of different colours are on sale. If one shirt is chosen at random if A is the event 'the shirt is medium' and B is the event 'the shirt is blue'. Are the events A and B independent ?

An urn contains 5 red and 5 black balls. A ball is drawn at random, its colour is noted and is returned to the urn. Moreover, 2 additional balls of the colour drawn are put in the urn and then a ball is drawn at random. What is the probability that the second ball is red?

A word consists of 9 letters, 5 consonants and 4 vowels. Three letters are chosen at random. What is the probability that more than one vowel will be selected?

Suppose that 5 men out of 100 and 25 women out of thousand are colour blind.A colour blind person is chosen at random.What is the probability of this being male (assuming that males and females are in equal proportion).

A box contains 5 red and 10 black balls. A ball is drawn at random, its colour is noted and is returned to the box. More over 2 additional balls of the colour drawn are put in the box and then a ball is drawn.what is the probability that the second ball is red.

A word consists of 9 letters: 5 consonants and 4 vowels. Three letters are chosen at random. Find the probability that the selection of the three letters contains more than one vowel.