If $A \cap B = B$,then

Consider the sets $\phi, A=\{1,3\}, B=\{1,5,9\}, C=\{1,3,5,7,9\}$. Insert the symbol $\subset$ or $\not\subset$ between the following pair of sets: $A \dots C$.

If $A, B,$ and $C$ are three sets,then $A \cap (B \cup C) =$

If $Q = \{x : x = \frac{1}{y}, \text{ where } y \in N\}$,then which of the following is true?

Let $A = \{1, 2, \{3, 4\}, 5\}$. Which of the following statements is incorrect and why? $\{ \{ 3, 4\} \} \subset A$

If $A = \{2, 3, 4, 5, 6\}$,then which of the following statements has a truth value of 'false'?