Three bags labelled R, B and W
cotains Red, Blue and White balls
respectively of equal sizes, the ratio
of the balls in the bag are R:B=2:3
and B:W= 4:5. All the balls are
removed into a big bag and properly
mixed together. If two balls are picked
at random one after the other with
replacement, find the probability of
picking
a) white ball and a blue
b). A blue ball first and then red ball
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