Three darts thrown at this dart board land in three different regions. if the order that the three darts are thrown does not matter, how many combinations of three different regions from the 10 possible regions would result in a sum of exactly 50 points?

Jane is cooking beans and rice for dinner tonight. she has 4 cans of black beans, 6 cans of red beans, and 3 cans of garbanzo beans in her cupboard. if she grabs a can of beans without looking at the label, what is the probability of her making black beans and rice for dinner?