Elliot wrote a computer program that randomly generates a number from 2 to 10. If he runs the program twice, what is the probability that the number generated both times is a prime number?

Well simply list the prime numbers within the range being 2,3,5,7. that means four out of nine chances in one go. But it is happening twice so we multiply 4/9 by two and the answer is still 4/9 when we simplify.