 Hi and welcome to the session. Let us just pass the following question. The question says a bag contains four red, five black and six white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is first part is white, second part is red, third part is not black, fourth part is red or white. Let's now begin with the solution. We will first find total number of balls in bag. In fact, so total number of balls in bag is 15. We have learnt that z equal to comes favourable to t. Using this formula, we will find the probability of getting white, red, not black and red or white ball. Now in the first part, we have to find probability that the ball drawn is white. It comes will be equal to probability that the ball drawn is white is equal to t that the ball drawn is equal to 1 minus probability of A that the ball drawn is black. We have to find the probability that the