<PRE><B>Question 1173746</B>
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When people solve such problems, &amp;nbsp;they should learn &amp;nbsp;THE &amp;nbsp;LOGIC &amp;nbsp;of the solution,

and that is all what they should know.



The people should not know these formulas --- this &amp;nbsp;TRASH, &amp;nbsp;that &amp;nbsp;@josgarithmetic tries to sell you.



Even do not try to understand or memorize these formulas --- keeping them in your mind is absolutely useless.



THEREFORE, &amp;nbsp;for a sake of your safety, &amp;nbsp;ignore his post and do not load this &amp;nbsp;TRASH &amp;nbsp;into your head / (your mind).



May god saves you from it . . . 



Keep your mind clean for more useful/vital tasks of your life.




/\/\/\/\/\/



&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;@josgarithmetic, &amp;nbsp;every time from now, &amp;nbsp;as I see similar &amp;nbsp;&quot;solution&quot; 
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;from you at this forum, &amp;nbsp;I will issue this message to a visitor.



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