You have a 3x3 square, fill with integers such that the sum for each row, for each column and in diagonal is 15. All the numbers must be different.
Hint: brute force is difficult (how many?), what would be number you put in the middle?
The Former Flickr Employees' Guide To Tumblr's Yahoo Survival - [image: Tumblr Yahoo]*Editor's note:* *Kakul Srivastava is CEO and co-founder of Tomfoolery, Inc. She was General Manager for Flickr from 2004 - 2009 and h...
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