SOLUTION: Please help me solve this problem: How many 4-letter code symbols can be formed with the letters P,D,Q,X without repetition?

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Question 601734: Please help me solve this problem: How many 4-letter code symbols can be formed with the letters P,D,Q,X without repetition?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
There are 4! = 4*3*2*1 = 24 different codes.