Shikhar has a bag with 2 balls, each of them can be black or white with equal probability. Now, he draws out a ball and it turns out to be black. After this event what is the probability that both balls are black?

• p(b)=p(w)=1/2;
  using bayes theorem
  p(b/a)=p(a nd b)/p(a) where a is already d occured event
  p(sec black/first already black)=(1/2*1/2)/1/2=1/2
• 11 years agoHelpfull: Yes(5) No(0)
• 1/2.......
• 11 years agoHelpfull: Yes(1) No(1)