what is the smallest 4 digit number using only 1 digit?

The smallest 4 digit number is 1000.
Since all the 4 digit should be 1. Therefore the smallest four digit number using only 1 is 1111.

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1111

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1

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1111

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that's1111

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The smallest 4 digit no. is 1000

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1000 as you have said using only 1 digit

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1111 is sure because if it is said 1000 there are two digits used 0 and 1 but in no.1111 there is only one digit used that is 1

if you say it is0000 the value is going to be 0 itself it becomes 1digit number

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