Which of the following is **TRUE**?
A$\{a, b\} \subset \{b, c, a\}$
B$\{1, 2, 3\} \subset \{1, 3, 5\}$
C$\{a\} \in \{a, b, c\}$ (as a subset relation)
D$\phi$ is **not** a subset of $\{1, 2\}$
Answer & Solution
Correct answer: A. $\{a, b\} \subset \{b, c, a\}$
Every element of $\{a, b\}$ is in $\{b, c, a\}$, so **A** holds.
- **B** is false: $2 \notin \{1, 3, 5\}$.
- **C** confuses $\in$ with $\subset$ — $\{a\}$ is a **subset** (not an element).
- **D** is false: the empty set is a subset of *every* set.
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