The area of a children square playground is 50m squared. a. what is the exact length of the playground
2. pine logs 3m long are to be laid around the playground. How many logs will need to be bought?

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?