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104 = 10000 if digits can be repeated, 5040 if not. The above answers assume a code can start with a 0. If not, 9000 if digits can be repeated and 4536 if not.
.0123456789
about 6966 times
1000 because there are ten possibilities 0123456789 and there are four slots but the first slot has to be zero so it is 10 times 10 times 10 times 1
Approximately 311 times