Iterables and Iterators

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    import itertools as it

    length = int(input()) chars = list(input().split()) size = int(input())

    combos = list(it.combinations(chars, size)) count1 = 0 for item in combos: count2 = 0 for numb in range(len(item)): if item[numb] == 'a': count2 += 1 if count2 >= 1: count1 += 1 print(str((count1/len(combos))))