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from itertools import combinations
num=int(input()) #taking n inputs
letter=input().split()# taking letter input
k=int(input()) #taking combinations input eg 2=ag
combination=list(combinations(letter,k)) #using list() to get length
combi_a=0
for i in combination:
if "a" in i:
combi_a+=1 #add one if a is found in i(combination)
print(combi_a/len(combination))
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Iterables and Iterators
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just for reference
from itertools import combinations num=int(input()) #taking n inputs letter=input().split()# taking letter input k=int(input()) #taking combinations input eg 2=ag combination=list(combinations(letter,k)) #using list() to get length combi_a=0 for i in combination: if "a" in i: combi_a+=1 #add one if a is found in i(combination) print(combi_a/len(combination))