Workers are loading boxes onto a truck. So far, they have loaded 48 boxes onto the truck.
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There are 26 - 10 = 16 girls. The number of ways to choose 2 girls from a set of 16 is C(16, 2) = 120. (Your class might be using a different notation for combinations, like .)
The number of ways to choose 2 people (boys or girls) from a set of 26 is C(26, 2) = 325.
The probability of choosing 2 girls is
Example: how to compute C(16,2):