Question: Hi! I need help with question 4 and 5. First, wouldn't the answer to 'a' be true because B has everything found in set U;

Hi! I need help with question 4 and 5. First, wouldn't the answer to 'a' be true because B has everything found in set U; similarly, wouldn't 'b' be true because it has everything found in U? Also for 'c'; wouldn't it be false because 0 is not part of the U set? For question 5, I am not sure what that sign means. Could you help me? Thanks!

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