Question 1174211
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Isn't it OBVIOUS ?



Or you need my formal confirmation with my signature ?



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To make you smiling, let me tell you that the missing number is what the author of this problem missed . . . 


(or keeps in his mind secretly from us . . . )




One more joke on the same line:  


            when I miss some thing in my house, and can not see it, I always say to myself:



                    this thing is there, where I can not see it.



            Believe or not, it always helps me to find the missed thing.


            You may try it on your own (!)



Thus visiting this forum, you may get useful practical advises (!)