Two urns each contain green balls and blue balls. Urn 1 contains 4 green balls and 6 blue balls, and urn 11 contains 6 greeb balls and 2 blue balls. A ball is drawn at random from each urn. What is the probability that both balls are blue?

The probability of both balls being blue is 8/10. Why? Because if you add the number of green balls out of both urns, which you add together, will give you your denominator, then you add the number of blue balls from each bag and get the total, that will be the numerator. So, everything will equal out to 8/10.