1 votes 1 votes QUESTION 8 : A bag contains 5 balls out of which some or maybe all are black. 2 balls are drawn from the bag and both are found to be black. What is the probability that all balls in the bag are black? Pooja Palod asked Jan 26, 2016 Pooja Palod 577 views answer comment Share Follow See 1 comment See all 1 1 comment reply richa07 commented Jun 2, 2016 reply Follow Share I think ans should be 1/4 Given than 2 balls are black,sample space for all other balls(N= Non black B=Black) {NNN,BNN,BBN,BBB} Here we can see chance of getting all black balls are 1/4 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes what is correct ans ?? 1/80 ?? or 1/8 ?? angelhoney answered Jan 26, 2016 angelhoney comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes 2 balls are drawn from the bag and both are found to be black that means we have to find out the probability of 3 balls to be black So, (1/2)*(1/2)*(1/2) = 1 / 8 angelhoney answered Jan 26, 2016 angelhoney comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes As three balls are left in the bag, we first draw the third ball & check for its colour & so on. Probability of all balls to be black is given by p(b)=p(third)*p(fourth)*p(fifth) =((1/3)*1/2)) * ((1/2)*(1/2)) * ((1)*(1/2)) =1/48 srivivek95 answered Apr 12, 2016 srivivek95 comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes I think ans should be 1/4Given than 2 balls are black,sample space for all other balls(N= Non black B=Black){NNN,BNN,BBN,BBB}Here we can see chance of getting all black balls are 1/4 richa07 answered Jun 2, 2016 richa07 comment Share Follow See all 0 reply Please log in or register to add a comment.