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

  • rejin_gunasekar1
     + 0 comments
    from itertools import combinations
N = int(input())
A = list(input().split())
K = int(input())
B = list(combinations(A, K))
count = sum(1 for x in B if 'a' in x)
print(count/len(B))