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Question Number 127698 by MathSh last updated on 01/Jan/21

$$-1!+2!-3!-5!+6!-4!!+7!!+8!!+9!!=2021$$$$HappyNewYear!$$

Commented by talminator2856791 last updated on 04/Jan/21

$$\mathrm{are}\mathrm{you}\mathrm{sure}\mathrm{this}\mathrm{is}\mathrm{true}?$$$$9!!\mathrm{seems}\mathrm{much}\mathrm{larger}\mathrm{than}\mathrm{any}\mathrm{of}\mathrm{the}\mathrm{other}\mathrm{numbers}.$$

Commented by talminator2856791 last updated on 04/Jan/21

$$\mathrm{how}\mathrm{did}\mathrm{you}\mathrm{find}\mathrm{this}?$$

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