00:01
So in our question, the success is defined as the success is defined as selecting a red ball, all right? and the question is asking to calculate the probability of two successes.
00:19
So basically we need to calculate what will be the probability of selecting two red balls.
00:29
And it is when we have the urn that contains the 15 balls, okay? these 15 balls have total 5 red color ball.
00:41
This has total 5 red colored ball and tens are different colored balls.
00:55
All right? now, since we are selecting three balls from the urn, okay? and we need to calculate that what is the probability of selecting exactly two red colored balls.
01:10
So the probability of selecting two red colored balls, okay? this is going to be equals to this is going to be equals to the number of ways in which we can select two red color balls out of the five colored balls times the rest of the balls that we have is 10 c1.
01:34
Okay since we have already selected two red color balls from the group of five color ball and we have left with ten balls and therefore we are going to select any ball any ball out of ten ball and divided by this is going to be our favorable outcome which is asked in our question which is going to define our success over the total number of ways in which we can select three balls out of the earn of 15 balls and this is going to be close to 15 c3...