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import itertools N, cases, K = int(input()), input().split(), int(input()) prob_consist_a = len([combo for combo in itertools.combinations(cases, K) if 'a' in combo]) / len(list(itertools.combinations(cases, K))) print(prob_consist_a)
You create the combinations 2 times instead of just one time which would be double the work instead of saving the combinations in a variable. just fyi
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Iterables and Iterators
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You create the combinations 2 times instead of just one time which would be double the work instead of saving the combinations in a variable. just fyi