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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))
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Iterables and Iterators
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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))