In a bag, there are 8 red, 7 yellow and 6 green balls. If one ball is picked up at random, what is the probability that it is neither red nor green?

A box contains 2 red, 3 green, and 2 blue balls. What is the probability that none of the balls drawn is blue?

The tickets numbered from 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket has a number which is a multiple of 3 or 5?

Twelve Tickets are numbered from 1 to 12. If one ticket is selected at random, then the probability that the number on the ticket is a multiple of 2 or 3 is :

A bag contains 5 black and 4 white balls. A man selects two balls at random. What is the probability that both of these are of the same colour?

If four whole numbers are chosen randomly and multiplied, probability that last digit is 1,3,7 or 9?