Larry used a pattern of colors to make a cube train he used a red cube a blue cube a red cube before he started thr pattern again he used 15 cubes. how many red cubes did larry use

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?