Solve this..
Fill the boxes using (1, 3, 5, 7, 9, 11, 13, 15)
U can also repeat the numbers..This question came in UPSC Final Exams held in Dec '13...... You will be glad to note that only Gaurav Agarwal (IAS Topper) could solve it.



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Hey there! 
Here's a snippet of my answer:

It is possible if you use factorial (! symbol) and do it like this: 


It means that [...] If you want to see more of it, go to where the original answer had been posted. Here's the link, cheers! :)