Question

Billy has a die. He rolls the die, and if the result is not even, he rolls the die

one more time. Find the probability that he ends up with an even number.

Answer 1

1/4 is the answer.

Explanation:

If he has a die then it is 6 sided. He has a 1/2 chance the 1st time that he gets a non-even number. The next time he also has a 1/2 chance of getting an even number so it's 1/2 times 1/2 = 1/4.