0:00
Hello.
00:02
So in this question, we're trying to determine the probability that the last earn contains j balls.
00:09
Okay? so first of all, we're going to start, so let's look at the first step.
00:18
So we're going to start by saying that we have a total of k ways, okay, to place n balls in k -earths.
00:51
We also know that the last and got j balls, right? so now the remaining, so the remaining, what's going to be the remaining? that's going to be n minus j, right? n minus j balls, right? to be placed, let's see.
01:42
That's going to be in k minus 1, ernst.
01:51
And so the total number, the total number of such ways, so total number of such ways, let's see, so that's going to be k minus 1 plus exponent n minus j.
02:28
So you can see that the j balls can be selected...