Abstract: In mathematics, the sign" (the exclamation point) is the sign factor, and indicates a number multiplied by all the decreasing (ie: 4! = 4 x 3 x 2 x 1 = 24). A girl is solving an equation in front of the professor, during a passage you forget to re-write the factorial symbol! 3.Il next to a professor told her: "Miss, do not you forget something?" the girl looks good " no professor, I realized all "prudent?" he answered "yes, I noticed the 3 in the denominator, do not worry" then the professor, "but what it means sorry for her that exclamation point?" and her candid "Fratto 3 golly "!
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