Question 1121426
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<pre>
1-9     (2 used  1 time - 105 to go) 
10-19   (2 used  1 time - 104 to go) 
20-29   (2 used 11 times - 93 to go) 
30-99   (2 used  7 times - 86 to go) 
100-119 (2 used  2 times - 84 to go) 
120-129 (2 used 11 times - 73 to go) 
130-199 (2 used  7 times - 66 to go) 
200-219 (2 used 22 times - 44 to go) 
220-229 (2 used 21 times - 23 to go) 
230-239 (2 used 11 times - 12 to go) 
240-249 (2 used 11 times -  1 to go) 
250     (2 used  1 time  -  0 to go)


250 is your answer (the brute-force way)
</pre>

Similar way of solution you may find at the link


<A HREF=https://answers.yahoo.com/question/index?qid=20150521162733AATuEl2>https://answers.yahoo.com/question/index?qid=20150521162733AATuEl2</A>


https://answers.yahoo.com/question/index?qid=20150521162733AATuEl2


But that solution contains numerous ERRORS  (actually, fatal errors) that I fixed in my post.