Question 921099
<pre>

_ _ _ 0

The tens digit can't be 2 or larger for even if it were 2,
the smallest the number could be would be 4320, and the
sum of the digits would be 9 not 7,

So the tens digit can only be 1


_ _ 1 0

The first two digits have to have sum = 6, and so the only
two different digits greater than 1 which have sum 6 are 4 and 2.

So the answer is 

4 2 1 0

Edwim</pre>