搜狗做题网英文概率计算要过程和解答,可中可英
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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?
第一轮r4/6---剩3r2w---第二轮r3/5
4/6*3*5=12/30
第一轮w2/6---剩4r1w---第二轮r4/5
2/6*4/5=8/30
12/30+8/30=2/3
4/6*3*5=12/30
第一轮w2/6---剩4r1w---第二轮r4/5
2/6*4/5=8/30
12/30+8/30=2/3