问题描述：
英文概率计算要过程和解答,可中可英
Two balls are drawn in succession without replacement from a box
containing 4 red and 2 white balls. What is the probability of
drawing a red ball on the second draw?
Two balls are drawn in succession without replacement from a box
containing 4 red and 2 white balls. What is the probability of
drawing a red ball on the second draw?
问题解答：
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