Question 1159399
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See also this web-page:


http://mathforum.org/library/drmath/view/56789.html



Some efforts were made there and some progress was achieved;

but the solution was not completed . . . 



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Below is my comment to the Edwin' solution.


<pre>
    In Math problems, if they are posed accurately, we always know, what we are doing, what is our goal, 

    we always can check, if our solution is correct, and when we complete the solution, we feel ourselves  enriched with knowledge.


    In puzzle problems, like this one, we don't know what we are doing, what is our goal; we can not check if our solution is correct,

    and when we complete a "solution", we are not enriched even for one single milligram of knowledge.


              <U>It is why I HATE these puzzles.</U>


    They suit for only one purpose:  to kill your time.

    And their authors make their money this way . . . by killing your time . . . 

    It is the only meaning of any activity with puzzles: you agree to kill your time for a sake making money to their authors.
</pre>