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Give all the possible 4 digit code combination in a number 0-9

 

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There are a total of 10,000 possible 4-digit code combinations using the numbers 0-9. To calculate this, you simply multiply the number of available digits (10) by itself four times (since there are four slots to fill):

10 x 10 x 10 x 10 = 10,000

So the possible 4-digit code combinations are:

0000, 0001, 0002, 0003, ..., 9999