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  1. # http://c...content-available-to-author-only...e.com/questions/1209/calculate-probability-of-getting-half-as-many-heads-as-coin-tosses/51443#51443
  2. # len = 99
  3.  
  4. from itertools import*
  5. n=int(input())
  6. print(sum(n/2==i.count("H")for i in product(*["HT"]*n))/2**n)
Success #stdin #stdout 0.02s 8736KB
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https://ideone.com/lboisi
Probability that exactly half of the coin flips are heads
language:
Python 3 (python  3.9.5)
created:
8 years ago
visibility:
public

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