What is the number of selections of at most 3 things from 6 different things?
42
To find the number of selections of at most 3 things, we calculate the sum of combinations for selecting 0, 1, 2, and 3 things from 6 different things:
C(6, 0) + C(6, 1) + C(6, 2) + C(6, 3) = 1 + 6 + 15 + 20 = 42.
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