Question 1182458
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Hello,  you just posted at least  3  (three,  THREE)  the same type problems and obtained at least  4  (four) 
answers/explanations from the tutors.



This your post is just  n4  in this row.



How many times we,  the tutors,  should explain/repeat you simple thing/things

in order for you finally get the method of solution ?



<H3>&nbsp;&nbsp;&nbsp;&nbsp;7 &nbsp;?   &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19 &nbsp;&nbsp;?  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;21 &nbsp;&nbsp;? &nbsp;? &nbsp;?</H3>