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What does this terminology mean?

  1. Jun 9, 2013 #1
    So in finding a pattern for the nth derivative for y = x-1 the book wrote

    y(n)(x) = (-1)nn!x-n-1

    What does the exclamation mark mean? I know != means not equal to.
  2. jcsd
  3. Jun 9, 2013 #2
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