Question 1210211
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How many positive integers are there whose digits strictly decrease from left to right, 
and have at most one even digit, and the sum of the digits is 6? 
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The answer in the post by @CPhill is incorrect.


<pre>
The numbers satisfying the imposed conditions are

    6, 51, 510, 321.


The number of such numbers is 4.
</pre>

Solved.