00:01
In this problem, it is said that a company received a shipment of 26 laser printers, including 8 that are defective.
00:08
Now, 2 of these printers are selected to be used in the copy room.
00:11
First of all, we have been asked how many selections can be made.
00:15
So, out of the 26 laser printers, 2 are selected.
00:19
This can be done in 26c2 ways.
00:21
Here we use c, which represents combination.
00:23
And we use combination and not permutation in this case because the order of selection does not matter.
00:28
So, what is the formula for ncr? that is n factorial over r factorial times n minus r factorial.
00:36
So, in this case, n is 26, r is 2.
00:39
So, we have 26 factorial divided by 2 factorial times the factorial of 26 minus 2, which is 24...