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OpenStudy (anonymous):
Liam is buying books for his summer reading collection. He has narrowed his choices down to 7 books and is planning to purchase 3. How many combinations exist?
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OpenStudy (anonymous):
guess that would be \[\dbinom{7}{3}\]
OpenStudy (anonymous):
\[\frac{7\times 6\times 5}{3\times 2}=7\times 5=35\]
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