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Question 91
A bag contains 7 blue balls and 5 yellow balls. If two balls are selected at random, what is the probability that none is yellow?
Solution
None yellow => both blue => is possible in $$^7C_2$$ ways
=> probability = $$\frac{^7C_2}{^{12}C_2}$$ = $$\frac{7}{22}$$
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