MCQ
Which of the following sets is an empty set?
- ✓$\{x \mid x$ is a positive integer and $x<0\}$
- B$\left\{x \mid x^2=4, x \in Z \right\}$
- C$\{x \mid x$ is a letter in the word "apple"$\}$
- D$\{x \mid x$ is a natural number and $x$ is odd$\}$
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