Permutations of 10 letters taken 3 a time = 10 x 9 x 8 = 720
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6*5*4*3*2*1 = 720
3,124,550 possible combinations
im assuming that any charcter can be a number or a letter: (24letters*10 possible numbers)^(4 digits)= 3317760000 possible combinations.
Depends on how many were possible. For instance on a test of 100 questions 80% would be a B.
10*9*8 = 720