SOLUTION: A bag contains seven white and five black discs. Three disks are chosen from the bag. Find the probability so that after each draw the disc is replaced by one of the opposite colou

Question 1154967: A bag contains seven white and five black discs. Three disks are chosen from the bag. Find the probability so that after each draw the disc is replaced by one of the opposite colour.
Answer by VFBundy(438) (Show Source): You can put this solution on YOUR website!
Probability of WHITE-BLACK-WHITE = 7/12 * 5/11 * 6/10 = 210/1320

Probability of BLACK-WHITE-BLACK = 5/12 * 7/11 * 4/10 = 140/1320

Probability of either = 210/1320 + 140/1320 = 350/1320 = 35/132
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