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