Which of the following is **NOT** an example of the empty set?
ASet of odd natural numbers divisible by 2
B$\{x : x \in \mathbb{N}, x < 5 \text{ and } x > 7\}$
CSet of even prime numbers
D$\{y : y \text{ is a point common to any two parallel lines}\}$
Answer & Solution
Correct answer: C. Set of even prime numbers
The only even prime is $2$, so the *set of even primes* $= \{2\}$ — **not empty**.
- **A**: odd numbers cannot be divisible by 2 → empty.
- **B**: no $x$ satisfies both $x<5$ and $x>7$ → empty.
- **D**: parallel lines never meet → empty.
NCERT Exercise 1.2 Q1.
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