A bag contains 4 yellow balls and "n" red balls. Two balls are drawn without replacement. Which expression represents the probability that one ball is yellow and ball is red?(adsbygoogle = window.adsbygoogle || []).push({});

P.S. the answer is (4/n+4)(n/n+3) + (n/n+4)(4/n+3)

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# How do you do this? on Probability(without replacement)

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