一道关于概率的英文数学题7) A box contains 3 red,4 white and 5 blue discs.Three discs are selected at randomfrom the box.Find the probability that:a) all three discs are the same colour,if the selection is with replacement b) all three dis
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![一道关于概率的英文数学题7) A box contains 3 red,4 white and 5 blue discs.Three discs are selected at randomfrom the box.Find the probability that:a) all three discs are the same colour,if the selection is with replacement b) all three dis](/uploads/image/z/1940343-15-3.jpg?t=%E4%B8%80%E9%81%93%E5%85%B3%E4%BA%8E%E6%A6%82%E7%8E%87%E7%9A%84%E8%8B%B1%E6%96%87%E6%95%B0%E5%AD%A6%E9%A2%987%29+A+box+contains+3+red%2C4+white+and+5+blue+discs.Three+discs+are+selected+at+randomfrom+the+box.Find+the+probability+that%3Aa%29+all+three+discs+are+the+same+colour%2Cif+the+selection+is+with+replacement+b%29+all+three+dis)
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