Oh, dude, it's like you're asking me to do math or something. Okay, so for a 2-digit code, you have 10 options for the first digit and 10 options for the second digit, so it's like 10 times 10, which equals 100 possible combinations. But hey, who's counting, right?
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There are 210 4 digit combinations and 5040 different 4 digit codes.
There are 10000 because there is 0001 to 9999 and then there is 0000.
There are seven possible digits for the first digit and 6 digits for the second (minus one digit for the digit used as the first digit) and 5 options for the last digit (minus one again for the second digit) and then you just multiply them all together to get a total possible combination of 210 numbers that are possible.
There are 30,240 different 5-digit numbers. Math: 10*9*8*7*6 1st digit has 10 possible choices (0-9) 2nd digit has 9 possible choices (one of the digits was used in the 1st digit) 3rd digit has 8 possible choices 4th digit has 7 possible choices 5th digit has 6 possible choices
105 = 100000