A bag contains blue and yellow marbles. One marble is selected at random from the bag and its colour is noted. It is then returned to the bag along with other marbles of the same colour. A second marble is now selected at random from the bag. What is the probability, in terms of , and , that the second marble is blue?
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only (i) and (ii)
only (ii) and (iii)
only (i) and (iii)
all of (i), (ii) and (iii)
none of (i), (ii) and (iii)
Select an option, then submit.
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