Each of two urns contains green balls and red balls. Urn I contains 10 green balls and 8 red balls. Urn II contains 3 green balls and 10 red balls. If a ball is drawn from each urn, what is P(red and red)?

Question

the answer is 18/31

Answer 1

I disagree. How did you arrive at that answer?
Remember, you multiply probabilities for independent events.