Question

放置10个白球,四个黄球,抽取4个球的概率运算

Answer 1

抽到4黄球的百分比:C(4,4)/C(14,4)=1*2*3*4/(14*13*12*11)=1/1001≈0.100%

抽到3黄1白的百分比:C(4,3)*C(10,1)/C(14,4)=4*100/1001≈3.996%

抽到2黄2白的百分比:C(4,2)*C(10,2)/C(14,4)=6*45/1001≈26.973%

抽到1黄3白的百分比:C(4,1)*C(10,3)/C(14,4)=4*120/1001≈47.952%

抽到4白球的百分比:C(10,4)/C(14,4)=10*9*8*7/(14*13*12*11)=30/143≈20.979%