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#when the <math>fu</math> and <math>tu</math> does not exist
 
#when the <math>fu</math> and <math>tu</math> does not exist
 
#when the units are in not same groups.
 
#when the units are in not same groups.
 
+
For example, the number of ways to achieve 2 heads in a set of four tosses is "4 choose 2".
 
Unit names and indications are case-sensitive.
 
Unit names and indications are case-sensitive.
  
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