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Jun 13th, 2018
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  1. sage: sum( [ (-1)^k * binomial(5,k) * factorial(7-k) for k in [0..5] ] )
  2. 2428
  3. sage: len([ s for s in SymmetricGroup(7) if prod([s(k)-k for k in [1..5]]) ])
  4. 2428
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