Three faces of a die are black, two faces are white and one face is red. The die is tossed three times. What is the probability that the colours black, white and red appear in the first, second and third tosses respectively?

A fair coin is tossed 4 times. What is the probability that two heads do not occur consecutively?

In a throw of three dice, what is the probability of getting one prime number, one composite number and one number which is neither prime nor composite?

An integer is chosen at random from the first 50 integers. What is the probability that the integer is neither divisible by 5 nor 9?