SOLUTION: A 4 key keypad with A, B, C, D that can be used to open the garage if in the correct order. Each key can only be used once. How many codes are possible?
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Question 879339: A 4 key keypad with A, B, C, D that can be used to open the garage if in the correct order. Each key can only be used once. How many codes are possible? Answer by jim_thompson5910(35256) (Show Source):
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