How many possibilities are there if you are creating a 4-digit password using the digits 0 through 9? you may repeat numbers.

a.) 40
b.) 6,561
c.) 5,040
d.) 10,000

Each number had 10 possibilities. So to calculate the number of possibilities for two numbers multiply 10 by 10. This means that for all 4 digits the number of possible permutations is 10x10x10x10 or 10 to the power 4. This equals to 10,000 therefore D.

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