2016年北京高考数学（理科）答案与解析
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②黑+黑，则丙盒中黑球数加![](https://wkrtcs.bdimg.com/rtcs/image?w=14&md5sum=56d774c97d02cfc2219ca2a6fa434776&sign=9d4c008983&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=250&ipr={"t":"img","w":"14","h":"20","c":"c4ca4238a0b923820dcc509a6f75849b.png"})
③红+黑（红球放入甲盒中www.gaosan.com），则乙盒中黑球数加
④黑+红（黑球放入甲盒中），则丙盒中红球数加
因为红球和黑球个数一样，所以①和②的情况一样多，③和④的情况完全随机．
③和④对B选项中的乙盒中的红球与丙盒中的黑球数没有任何影响．
①和②出现的次数是一样的，所以对B选项中的乙盒中的红球与丙盒中的黑球数的影响次数一样．
综上，选B．
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16．
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19．
方法二：
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