Kai bought a four-digit combination lock for this bicycle. Unfortunately, he forgot the code. The only thing he remembers is that the code contains the digits 1,5,7, and 8. list all the possible codes and determine the number of permutation made
ryoko92
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Answer:
There are 4 options for the first digit, 3 for the second, 2 for the third, leaving no choice for the last digit as all other digits have been chosen.
So, 4 x 3 x 2 = 24