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  1. Prepare
  2. Python
  3. Itertools
  4. Iterables and Iterators
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Iterables and Iterators

  • babafun
     + 1 comment
    import itertools

N, cases, K = int(input()), input().split(), int(input())
prob_consist_a = len([combo for combo in itertools.combinations(cases, K) if 'a' in combo]) / len(list(itertools.combinations(cases, K)))
print(prob_consist_a)