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4579 is the smallest even number he can make
From left to right, pick the smallest possible digit every time. This will give you the smallest possible number.
The smallest four digit number is 1000. It is even so 1001 is the smallest four digit number that is odd.
1000
100012
The smallest is 1111 if repeats are allowed. If not, it is 1235.
12346
1243
-7510 is the smallest.
11,111If you don't want to use any digit more than once, then it's 13,579 .
00000 or 00001