Question
In a bag, there are 7 red balls, 5 black balls, and 9
green balls. If two balls are selected at random, what is the likelihood of picking one red ball and one black ball?Solution
Total number of balls in the bag = 7 + 5 + 9 = 21 Probability that a red ball and a black ball are drawn = 7C1 × 5C1/21C2 = 7 × 5/210 = 1/6
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