Complemento de un ángulo de 80 grados?:(​

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

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?

Proving the congruent supplements theorem