THE SMALLEST NO. OF 4 DIGIT THAT DOES NOT CHANGE WHEN ITS ARE WRITTEN IN REVERSE ORDER IS________________.

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Solution

We know that the smallest four digit number is 1000.

But if we write this number in reverse order, it will become 0001 which is not same as 1000.
The next four digit number is 1001 and if we write this number in reverse order, we again get
1001.
Hence the smallest four digit number which does not change when written in reverse order is
1001.

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