an urn contains 5 yellow, 6 green and 7 blue balls. two balls are randomly drawn without replacement

an urn contains 5 yellow, 6 green and 7 blue balls. two balls are randomly drawn without replacement. find the probability of the following events:
A. both balls are green
B. the first ball is blue and the second is yellow
C. there is one green and one yellow ball

 

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