00:01
Hello, so today we are going to answer a question about probability and then also answer a question about the number of combinations of different numbers.
00:09
So let's start with that probability question.
00:14
So what we want to think about here and keep in the back of our mind is the complement rule, which says that the probability of a compliment happening is one minus the probability of the actual event happening.
00:31
So we're going to start by going, oh, how many multiples of 11 do we have? so we have 11, 22, 33, 44, 55, 66, and 77.
00:52
So we can see that that is seven different possibilities.
00:59
And we're going to calculate the probability first of what is the probability that they will pick up a number that is a multiple of 11.
01:08
And we can see that that is the number of possibilities we have there out of 80, which is equal to 0 .0875...