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 code positions can be any of the 10 digits, from 0 through 9. Since digits can be repeated, there are 10 choices for each position, giving 10 × 10 × 10 = 1,000 possible codes. The correct choice is 1,000.

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