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# Enter your code here. Read input from STDIN. Print output to STDOUTfromitertoolsimportcombinationsn=int(input())ls=input().split()k=int(input())combination=list(combinations(ls,k))count=0forcomboincombination:if'a'incombo:count+=1print(count/len(combination))
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Iterables and Iterators
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