00:01
With this marbles problem, we're choosing three marbles.
00:05
And it doesn't matter what order that we are getting them in.
00:10
Just what does matter is the total that we have.
00:14
So there's three red, there's two green, one lavender, and then two yellow, two orange.
00:31
So when i'm trying to get at, is if you choose the two green and then one lab.
00:37
Lavender would be the same as one lavender and then two green.
00:40
So the order does not matter.
00:42
So you're going to do a combination where there's three, four, five, six, seven, eight, nine, ten marbles to choose three of.
00:53
Now in calculator speak, we might write it this way, where you write the first number factorial over the second number factorial and then you subtract the two to ten minus three, it's seven factorial...