Lock
Number Theory
Level
2
Dan's 4-digit lock contains the digits 0-9. If he says that the number is greater than 3586, how many possible passwords are there?
6414
6412
6416
6415
6413
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The allowable combinations start at 3587 and end at 9999. Therefore, there are 9999 - 3587 + 1 = 6413 combinations. Ed Gray