Adela has a bag containing 5 Yellow, 3 Black & 12 Red coloured marbles (a) She picks one marble out at random, notes the colour and puts it back in. What is the probability she picks a Black or a Yellow marble b) She then repeats the above experiment, picking out one marble and noting its colour. She replaces it in the bag and then picks a second time. What is the probability she selects two marbles of the same colour? (c) Frankie says that because most of the marbles are Red, there is a greater chance of selecting at random 3 Red marbles in a row, replacing the marbles each time, than there is selecting just 2 Black marbles consecutively. Is she right. You must show your working