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  1. import operator as op
  2. def ncr(n, r):
  3.     r = min(r, n-r)
  4.     if r == 0: return 1
  5.     numer = reduce(op.mul, xrange(n, n-r, -1))
  6.     denom = reduce(op.mul, xrange(1, r+1))
  7.     return numer//denom
  8.  
  9. ans = 0
  10. for i in range(1, 11):
  11. 	ans += ncr(10, i) * (2**(9-i+1))
  12. print ans
Success #stdin #stdout 0.01s 9024KB
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https://ideone.com/rPYmKy
language:
Python (cpython 2.7.16)
created:
9 years ago
visibility:
public

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