So i need some help on this like a lot and ill be posting a lot and answering a lot

Which statements about these triangles is true

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?