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You can find the constant of proportionality by finding the ratio of

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?

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30