Byron bought a keyless entry door lock that has the digits 0 through 9 on the keypad. He wants to choose a three-digit entry code. How many different combinations are possible, if the digits can be repeated?

Each of the three positions in the code can be filled by any of the 10 digits, 0 through 9. Since digits can repeat, there are 10 × 10 × 10 = 1,000 possible codes. The correct choice is 1,000.

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