Answer:
7/21=1/3
Explanation:
In order to solve this we first have to calculate the total of the possible outcomes when withdrawing a tshirt from the drawer and we do that by adding all of the shirts:
8+6+7=21
And to calculate the probability of getting a white shirt from the drawer we divide the number of deisred outcomes by the total number of outcomes, since there are 7 white shirts, we divide that by 21, and reduce:
7/21
1/3
So there is 1/3 chance you get a white shirt when pulling a random shirt from the drawer.