00:01
So, paul has an apple, an orange, a pear, and a banana at home.
00:07
So, let's write those out.
00:09
Apple, pear, orange, banana.
00:13
And he's going to bring two pieces of fruit for lunch.
00:17
How many different pairs of fruit could he bring to school? so i'll start by just listing them out so we can get the answer.
00:22
And then i'll show you a more proper way of doing it, of counting this.
00:27
So he has one apple, one orange, one pair, one.
00:30
Banana.
00:31
He's going to be picking two of them.
00:32
Maybe he picks apple, pear.
00:34
That's one option.
00:35
Or maybe he picks orange or maybe apple banana.
00:39
Okay, that's three possible pairs he could bring.
00:43
Now, he could bring a pear and an orange.
00:46
I'm not going to put down pear apple because that's the same thing.
00:49
That's an important note to make here.
00:51
The order in which he picks these fruit doesn't matter.
00:57
Apple pear, pear, pear is the same thing.
01:00
He's bringing the same two fruit to launch.
01:02
Okay, maybe he brings pear banana.
01:05
Or maybe he brings orange banana.
01:08
So if i add these up, i have all possible ways of picking two of these four letters...