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  2. Python
  3. Itertools
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Iterables and Iterators

  • shikha569sharma
     + 0 comments
    from itertools import combinations 

N = int(input())
N_list = input().split()
K = int(input())

all_comb = list(combinations(N_list, K))
length = 0
for i in all_comb:
    if 'a' in i:
        length +=1
probability = length / len(all_comb)
print(round(probability, 6))