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Mathematics 18 Online
OpenStudy (experimentx):

Find the total number of rectangles in chess board.

hero (hero):

1296

hero (hero):

l asked Dr. Math.

OpenStudy (experimentx):

how fast did Dr. Math reply?

hero (hero):

Almost instantly

OpenStudy (experimentx):

haha Dr. Math ... crazy guy!!

hero (hero):

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

OpenStudy (experimentx):

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

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