Write the smallest 6-digit number using the digits 1, 0 and 5.

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A 555510
B 105100
C 510510
D 100005

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Answer: D. 100005

To make the smallest 6-digit number, start with the smallest non-zero digit 1, fill the middle with zeros and put the 5 last: 100005. A number cannot start with 0.

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Write the smallest 6-digit number using the digits 1, 0 and 5.

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