Changes

*If the order is not a matter, it is a Combination.  

*If the order is not a matter, it is a Combination.  

*If the order is a matter it is a Permutation.

*If the order is a matter it is a Permutation.

*A combination is denoted by nCr or <math>\binom{n}{r}</math> or <math>C(n,r)</math>.  

*A combination is denoted by <math>^nC_r</math> or <math>\binom{n}{r}</math> or <math>C(n,r)</math>.  

*A formula for the number of possible combinations of <math>r</math> objects from a set of <math>n</math> objects is:

*A formula for the number of possible combinations of <math>r</math> objects from a set of <math>n</math> objects is:

  <math>\binom{n}{r}=\frac{n!}{r!(n-r)!}</math>  

  <math>\binom{n}{r}=\frac{n!}{r!(n-r)!}</math>