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# Enter your code here. Read input from STDIN. Print output to STDOUTimportitertoolsn=int(input())lower_case=input().split()k=int(input())count_a=0comb=list(itertools.combinations(lower_case,k))foriincomb:if("a"ini):count_a=count_a+1print(count_a/len(comb))
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Iterables and Iterators
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