math
posted by victoria .
For this problem, assume that you are to pick 3 cars from the motor pool, which contains 6 subcompact cars, 6 compact cars, and 5 midsize cars.
How many ways can you pick the cars so not all are the same size?

So what you want is one car from each of the groups, clearly the number of ways is
6x6x5 or 180 ways
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