When an ordinary die is thrown twice, the probability that the sum of the two numbers obtained is 6, will be:

The probability of getting the sum as a prime number, when two dice are thrown together, is :

Three different numbers are selected at random from the first 15 natural numbers. What is the probability that the product of two of the numbers is equal to third number?

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?

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