A game consists of randomly choosing a bag (labelled 1,2 or 3) out or a choice of 100, and then again randomly, picking a ball (red or black) from it. Each bag has the same total number of balls (10) a)complete the tree diagram B)work out the probability that a player will select a red ball
C) the same player is going to play the game 200 times consecutively. How many black balls should he expect to pick?