a box contains 5 red balls and 7 black balls.3 balls are selected at random from the box one after the another without replacement .the probability that selected set contains 2 red balls and 1 black ball is ????
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probability = no.of possible outcomes/ total no.of outcomes
= (2+1) / 5+ 7+ 3
= 3/ 15
= 1/5
= (2+1) / 5+ 7+ 3
= 3/ 15
= 1/5
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