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

  • chrisviemric_cu1
     + 0 comments
    from itertools import combinations

#total possible outcome
N = int(input())

#list of outcomes
l = list(input().split())

#desired outcome
n = int(input())

new = list(combinations(l, n))

count = 0

#calculation for the probability of 'a' being in the strings given
for i in new:
    if 'a' in i:
        count += 1


print(f"{count/len(new):.12f}")