00:01
In the first question we're given there are six types of bread, four types of cheese and three types of meat.
00:09
And we want to make a sandwich where we must make one choice for each option.
00:13
So the number of choices to make this sandwich would be.
00:17
Now take note that the choices are made without replacement and that among the category of bread's, cheese and meats, we can only make one choice.
00:31
Each.
00:33
So the total number of ways to choose the bread will be six choose one.
00:43
Now n improbability is times or is plus.
00:49
So n has times.
00:51
From the four cheeses, we will choose one.
00:55
And from the three meats, we will choose one.
00:59
Now for choose this combination.
01:02
So if i have n distinct object and i want to choose r of them, it will be n factorial over r factorial times n minus r factorial.
01:14
So six choose one will just be six, four choose one is four and three choose one is three.
01:20
And so the answer is 72...