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3x9
3x9
Number 759
Date Jun. 28th 2010
Previous Raptor Fences
Next Moria

3x9 is the 759th xkcd comic.

ExplanationEdit

Mouseover textEdit

"Handy exam trick: when you know the answer but not the correct derivation, derive blindly forward from the givens and backward from the answer, and join the chains once the equations start looking similar. Sometimes the graders don't notice the seam."

See alsoEdit

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