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from itertools import combinations
n=int(input())
y=input().split()
f=int(input())
c=list(combinations(y,f))
d=0
for i in c:
if "a" in i:
d+=1
print(d/len(c))
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Iterables and Iterators
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from itertools import combinations n=int(input()) y=input().split() f=int(input()) c=list(combinations(y,f)) d=0 for i in c: if "a" in i: d+=1 print(d/len(c))