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  1. from fractions import *
  2.  
  3. def f(k,n):
  4.     if n <= 2:
  5.         return 0
  6.     if k < 1 or k > n:
  7.         return 0
  8.     if n == 3:
  9.         if 1 == k == 3:
  10.             return Fraction(1,3)
  11.         if k == 2:
  12.             return Fraction(-2,3)
  13.     return (Fraction(6*(k-n)*(k-1),(n-2)*(n-1)) + 1)*Fraction(30,n*(n+1)*(n+2))
  14.  
  15. temp = f(2,12)
  16. print(temp)
  17. print(float(temp))
Success #stdin #stdout 0.14s 14736KB
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0.006243756243756244
https://ideone.com/jPfyE5
language:
Python 3 (python  3.9.5)
created:
11 years ago
visibility:
secret

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