A= {1, 3, 5, 7, 9}
b = {2, 4, 6, 8, 10}
c = {1, 5, 6, 7, 9}
a ∪ (b ∩ c) =

answers:
{1, 5, 7, 9}
{1, 3, 5, 6, 7, 9}
{1, 5, 6, 7, 9}

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