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Combinations

On a Casio calculator you can calculate a combination with the key

nCr

The English lettering reads 'from n Choose r'.

 


Example 1

To calculate

 4  nCr  2  =  4C2
           6.

 


Example 2

To calculate

 0  nCr  0  =  0C0
           1.

 


Example 3

To determine how many different 4-member groups can be organized in a group of 10 individuals

 1   0  nCr  4  =  10C4
         210.

 


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