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Digit 1 = 10 choices (0,1,2,3,4,5,6,7,8,9)

Digit 2 = 10 choices (0,1,2,3,4,5,6,7,8,9)

Digit 3 = 10 choices (0,1,2,3,4,5,6,7,8,9)

Digit 4 = 10 choices (0,1,2,3,4,5,6,7,8,9)

Number of combinations = 10 x 10 x 10 x 10 = 104 =10000

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