It's ' B B B ', where 'B' is the symbol for eleven.
In decimal notation, its value is
[ 11 x (12)2 ] + [ 11 x (12)1 ] + [ 11 x (12)0 ] = 1,584 + 132 + 11 = 1,727
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Probably 19998: from -9998 to 9999 (both inclusive) whose sum is 9999.
Using a calculator will make it easier
The smallest four digit number is 1000. It is even so 1001 is the smallest four digit number that is odd.
your answer will be the result of 999 times 9
9876 is the largest four digit number you can make if all the digits must be different.