Coloured balls are distributed in four boxes as shown in the following table:

A box is selected at random and then a ball is randomly drawn from the selected box. The colour of the ball is black. What is the probability that ball drawn is from box III?

Coloured balls are distributed in four boxes as shown in the following table: A box is selected at random and then a box is randomly drawn from the selected box. The colour of the ball is black, what is the probability that ball is drawn from the box III?

Coloured balls are distributed in four boxes as shown in the figure A box is selected at random and then a ball is randomly drawn from the selected box. The colour of the ball is black, what is the probability that ball drawn is from the box III?

Coloured balls are distributed in three bags as shown in the following table: A bag is selected at random and then two balls are randomly drawn from the selected bag. They happen to be black and red. Find the probability that they come from bag I?

Three bags contains a balls as shown in the following table: A bag is selected at random and two balls are drawn. They happen to the white and red. What is the probability that they come from the third bag.

Let n_1 and n_2 be the number of red and black balls respectively, in box I. Let n_3 and n_4 be the number of red and black ball respctively, in box II.: One of the two boxes , box I andbox II, was selected at random and a ball was drawn randomly out of this box. The ball was found to be red. If the probability that this red ball was drawn from box II is 1/3 , then the correct option(s) with the possible values of n_1, n_2, n_3 and n_4 is (are):

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that is the ball drawn is : red?

Suppose we have four boxes A,B,C and D containing coloured marbles as given below: One of the boxes has been selected at random and a single marble is drawn from it. If the marble is red, what is the probability that it was drawn from box A?

Suppose we have four boxes A,B,C and D containing coloured marbles as given below: One of the boxes has been selected at random and a single marble is drawn from it. If the marble is red, what is the probability that it was drawn from box B?