00:01
We have seven total students and we're going to make a committee of just four of them.
00:04
So this committee, it's only going to consist of four students and their order in this committee doesn't matter.
00:10
That is, every student has the same rate.
00:12
They're just on the committee.
00:13
So we can pick four random students.
00:16
How about this one, this one, this one, and this one, chosen completely at random.
00:24
Well, the order that i picked them in doesn't matter.
00:26
And whenever you hear that order doesn't matter, you should think combination.
00:30
So we're going to be doing a combination.
00:33
The total number of students we have was going to be the larger number in the combination, in this case seven.
00:39
And then the smaller number in the combination, that is the number of total people you are picking out, is four.
00:45
That is the number of people in this committee that we've chosen.
00:50
So what is the combination of seven and four? let's figure that out using the formula from the book...