00:01
This is a probability question and there are totally 8 microwave allens.
00:07
So there are 8 1.
00:08
So 2 of them defective units.
00:12
So the defective 1, defective which is 2, non -defective, which is 6 because totally we got 8 microwave.
00:23
And rest and buys 3 of them.
00:25
So first of all, let's find the sample space.
00:28
Since there's a selection here, total eight we have, we have to select three, any three of them.
00:34
So eight three combination, that is eight factorial, eight minus three factorial times three factorial.
00:42
So that would be eight factorial divided by five factorial times three factorial.
00:47
This is eight, seven, six, and five factory, divided by five factorial times three factorial.
00:54
These are done.
00:55
Three factorial is six.
00:56
We can also just simplify this.
00:58
And we got 56.
00:59
So totally this restaurant can buy 56 different options from this one.
01:06
What is the probability of the restaurant buying at least two non -defective? so what about for the restaurant? so the possible cases, the defective here, so they can buy the defective one and the non -defective...