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2021-04-21 11:51:23 ѡ��Ƹ�� http://www.huatu.com/ ��Դ��¿��

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ĳ�ؾ��ļ��齱���ÿλ��߾��һ�γ齱��ᡣ���һ��Ƚ��񽱹��£��齱ʱ��0��9��10��һ��ȡ4��ͬ��֣��췽��ʱ��ȡ��4��ͬ��ȫ��ͬ��һ�Ƚ��ǡ��3��ͬ��Ƚ��ǡ��2��ͬ��Ƚ��߻񽱵ĸ��ǣ�

A. $\frac{13}{25}$

B. $\frac{14}{27}$

C. $\frac{16}{35}$

D. $\frac{23}{42}$

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�ڶ��񽱵ĸ��ʣ�1��񽱵ĸ��ʣ��񽱵��ɷ�Ϊ��ࣺ��ǡ��һ��ͬ��ĸ��־��ͬ��ܵ��Ϊ $C^4_{10}$ ��񽱵ĸ��ʣ�1- $\frac{C^1_4C^3_6+C^4_6}{C^4_{10}}=1-\frac{95}{210}=\frac{23}{42}$ ��
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