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fromitertoolsimportcombinationsN=int(input())N_list=input().split()K=int(input())# Generate all combinations oncecombs=list(combinations(N_list,K))# Count the combinations that contain 'a'counter=sum(1forpairincombsif'a'inpair)# Print the ratio of valid combinationsprint(counter/len(combs))
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Iterables and Iterators
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