Math and Number Puzzles

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Multiple Choice

Expansion of exp(-x) is ..

  1. 1+x+(x^2)/2!+(x^3)/3!+..
  2. 1-(x^2)/2!+(x^4)/4!-...
  3. x-(x^3)/3!+(x^5)/5!+..
  4. 1-x+(x^2)/2!-(x^3)/3!+...
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