Give a counter example to the following statement. all quadrilaterals are rectangle

What is a graph with a never ending line called?

How far could you drive on 50 gallons of gas

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?