Question 859588
{{{P(B1)=70/(70+200+120)=70/390=7/39}}}
{{{P(R)=120/(69+200+120)=120/389}}}
{{{P(B2)=69/(69+200+119)=69/388}}}
{{{P(B1,R,B2)=(7/39)(120/389)(69/388)}}}

{{{P(B1,R,B2)=4830/490529}}}