00:01
Here, the total number of batteries we have that is 100 and number of defective batteries 4 and non -defective will be 96.
00:23
So, number of batteries to be selected randomly, randomly selected that is 2.
00:34
So, formula to select the 2 batteries that is ncr is equals to n factorial divided by r factorial multiplied by n minus r factorial.
00:50
So, number of total possible outcomes are 100 and 2 are selected.
00:55
So that means, 100c2 is equal to 100 factorial divided by 2 factorial multiplied by 98 factorial.
01:06
So, we will get 4950.
01:10
So, there are 4950 number of possibilities to select 2 batteries randomly for 100 batteries.
01:17
Now, we have to find out the possible outcomes that at least one of the battery is defective.
01:22
So, there are 2 possibilities that is one is defective and one is non -defective and second possibility is both are defective...