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

  • srinadhc07
     + 0 comments
    # Enter your code here. Read input from STDIN. Print output to STDOUT
from itertools import combinations
n=int(input())
ls=input().split()
k=int(input())
combination=list(combinations(ls,k))
count=0
for combo in combination:
    if 'a' in combo:
        count+=1
print(count/len(combination))