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2015-04-08T21:09:04+05:30

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When adding odd numbers the answer do not give an even number. So this sum can be solved through factorial method. ⇒So, The ans is :-⇒[3 ! + 15 + 9 = 30 ]
0
But the text says "fill the boxes using (1, 3, 5,...)". Why would it allow the use of "!"? I mean, I guess there's no other way but it just seems like a badly written problem then, since it restricts what should be used inside the boxes.
I just saw a comment on facebook that said "11,9 + 11,1 + 7" (, being the decimal seperator). The question technically allows the use of "," in the text :D
2015-04-09T10:48:20+05:30
By using factorial sign !

3! + 11 + 13 = 30

3! means = 3*2*1
               =6
So we concluded that

6 + 11 +13 = 30
1 5 1