A bag contains 7 black, 9 violet and 12 oranges balls. T wo balls are drawn at random. What is the probability that none of the balls drawn is orange?
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Answer:
two drawn out of 28 (7+9+12) so 28c2
none of orange means
only consider black and white balls so
7c2+9c2
p=(7c2+9c2)/28c2
Step-by-step explanation:
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