Question 762630
a box contains 6 white counters and 5 yellow counters. a counter is picked at random from the box and replaced. a second counter is then picked and a third counter is also picked. find the probability that
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Note: Because of "replacement" the events are independent.
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a) the third counter is white given that the first counter is white
The 3rd selection is not affected by the 1st selection.
Ans: 6/11
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b) all the counters are yellow
Ans: (5/11)^3 
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c) the counters are of different colours
Note: With 3 selections there must be two counters of the same color.
Ans: 0
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Cheers,
Stan H.
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