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#10
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You are wrong.
The probability of drawing 5 blue balls from 9 blue and 1 red ball is (9/10)*(8/9)*(7/8)*(6/7)*(5/6) = 5/10=0.5 exactly. your (0.9)^5 applies to the case when balls would be put back into the box after each removal, which was not the case here. |
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