Question 873680
10 Letters, 5 Numbers 
Choosing four alphanumeric characters with no repeats...How many are There?
N
0 {{{10C4)}}}
1 {{{(10C3)(5C1)}}}
2 {{{(10C2)(5C2)}}}
3 {{{(10C1)(5C3)}}}
4 {{{(10C0)(5C4)}}}