Remember...We use combinations when the order of an arrangement is NOT important!










Let's try a few....


Evaluate:   6C3


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How many different committees of 4 students can be formed from a group of 9 students?
 

 

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How many different 2 letter combinations can be formed using the letters in the word HISTORY?
 


 

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How many 5 marble groupings can be made from a collection of 20 marbles. 
Order is not important.
 



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This is a tricky one..but go ahead and try it before you click for the solution.
The city council is made up of 5 Democrats and 4 Republicans.  How many different combinations of 4 committee members are there if the committee must have 2 Democrats and 2 Republicans on it?
 





 

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