experimentX
Find the total number of rectangles in chess board.



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Hero
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1296

Hero
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l asked Dr. Math.

experimentX
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how fast did Dr. Math reply?

Hero
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Almost instantly

experimentX
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haha Dr. Math ... crazy guy!!

Hero
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Actually, it was a question that someone else asked that was answered years ago.

experimentX
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i didn't know that ... once you know the trick, you can answer almost instantly.