SOLUTION: In how many ways can 6 letters be chosen from {R,S,T,U,V,W,X,Y,Z}, assuming that the order of the choices doesn't matter and that repeats are not allowed?

Question 889970: In how many ways can 6 letters be chosen from {R,S,T,U,V,W,X,Y,Z}, assuming that the order of the choices doesn't matter and that repeats are not allowed?
Answer by Edwin McCravy(20055) (Show Source): You can put this solution on YOUR website!

9 Choose 6 = 9C6 = C(9,6) =  = 84

=  =  =  =
  
  3  4
 =  3*4*7 = 84

On a TI calculator

Press ON
Press CLEAR
Press 9
Press MATH
Press left arrow key <
Press 3
Press 6        See:   9 nCr 6
Press ENTER    See:        84

Edwin

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