If three unbiased coins are tossed, find the probability that they are all heads

Two numbers are removed at random from the numbers 1, 2, 3 and 4. What is the probability that the sum of the numbers removed is even?

Find the probability that a number selected at random from 41 to 56 is a multiply of 9

Find the probability that a number selected at random from 40 to 50 is a prime

Bello chooses a number randomly from 1 to 10. What is the probability that it is either odd or prime?