00:01
Hello students, let's solve this problem.
00:02
The problem says when the four digits, that is given here four digits, the number are between zero and of nine, are randomly selected with the replacement for and the lottery ticket.
00:22
What is the probability that three are even? so that is the problem.
00:31
We have to find out this solid.
00:33
So there is the four places.
00:37
So one, two, three, four, there is the choice for 10, 10, 10 as well as 10.
00:45
So we can see that each of these four digits can be selected in 10 ways.
00:52
So total number of the ways selecting the four digit from 0 to 9.
00:58
So that is the way, so we can say that the ways.
01:03
Is 4c2 combination.
01:07
So 4 factorial divided by 2 factorial multiplied with 2 factorial.
01:13
So it is of the 6 ways...