GMAT Quantitative Reasoning Practice Test 4

Question : 57 of 100

Marks: +1, -0

In how many combinations can we choose 2 students out of 10 if each student is needed to fill a different roll in the student's council?

Solution:

For the first roll there are 10 free students, for the second roll there are only 9 left. Therefore, we have

10 × 9 = 90

combinations total.

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