The possible 4 digit codes using the numbers 0-9 are every number between 0 and 9999. For numbers that have less than 4 digits, just precede the number with 0's.
10,000 possibilities
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We don't generally consider the negative factors of positive numbers, but they are exactly the same digits as the positive factors, just with minus signs.
Placing a question mark at the end of a phrase does not make it a sensible question. Please use complete sentences and, if possible, include context.
Bakugan Dimensions
You need at least two numbers to find a GCF.
their both based on units of measure