Question

90个球有3种颜色,红蓝白各30个,随机不放回抽出10个球,三种颜色都抽到的概率是多少

Answer 1

三种颜色都抽到的概率是

1-(C(30,0)*C(60,10)-C(60,0)*C(30,10))*3/C(90,10)

=1-(75394027566-30045015)*3/5720645481903

=1-75363982551*3/5720645481903

=1-226091947653/5720645481903

≈1-0.039522104

=0.960477896