The chance of defective screws in three boxes `A ,B ,Ca r e1//5,1//6,1//7,` respectively. A box is selected at random and a screw draw in from it at random is found to be defective. Then find the probability that it came from box `Adot`

The chance of defective screws in three boxes A,B, Care 1/5,1/6,1/7, respectively.A box is selected at random and a screw draw in from it at random is found to be defective. Then find the probability to be defective. A.

There are N+1 identical boxes each containing N wall clocks.r^(th) box contains (r-1) defective and (N-r+1) effective clocks for 1<=r<=N+1. A box is selected at random and from this box a clock is chosen at random and is found to be effective,the probability that it is from km box is (2N2k+lambda)/(N^(2)+N) then find lambda .

There are N + 1 identical boxes each containing N wall clocks. r^(th) box contains (r - 1) defective and (N-r+1) effective clocks for 1lerleN+1. A box is selected at random and from this box a clock is chosen at random and is found to be effective, the probability that it is from km box is (2N – 2 k +lambda)/(N^2+N) then find lambda.

Numbers of balls in three boxes are as follows. One box is selected of random and two balls are drawn which are of red colour and white colour each. What is the probability that selected ball is of from box 1 ?

A box contains 4 orange and 4 green balls, another box contains 3 orange and 5 groen balls, one of the two box is selected at random and a ball is drawn from the box, which is found to be orange. Find the probability that the ball is drawn from the first box.