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max2010maxim [7]
3 years ago
9

What is the number of combinations of 7 things taken 3 at a time?

Mathematics
1 answer:
Helga [31]3 years ago
7 0
C_7^3=\dfrac{7!}{3!4!}=\dfrac{5\cdot6\cdot7}{2\cdot3}=35
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