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In [6]: threes = set(range(3, 1000, 3)) fives = set(range(5, 1000, 5)) threes_n_fives = threes | fives sum(threes_n_fives)
threes = set(range(3, 1000, 3)) fives = set(range(5, 1000, 5)) threes_n_fives = threes | fives sum(threes_n_fives)
Out[6]: 233168
233168
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