Maths! pls help m Q: Factorize the following
x2-6xy+9y2-4z2
this is question
i have written x2 amd 4z2 and 9y2 here 2 means square​

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?