Aribooh2256 Aribooh2256

20-05-2017
Mathematics

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A geography teacher lists 12 South American countries on the chalkboard. She asks each student in her class to write a report comparing 3 of the countries. How many ways are there to select 3 of the 12 countries

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mjankiewicz mjankiewicz

20-05-2017

Newton's symbol

[tex]C_{12}^3={12\choose 3}=\frac{12!}{(12-3)!*3!}=\frac{12!}{9!*3!}=\frac{9!*11*\not12^2}{9!*\not3*\not2*1}=11*2=22[/tex]

Answer = 22

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