Which is an infinite set?

Which is an infinite set?
  1. $\{x : x \in \mathbb{N}\}$
  2. $\{x : x$ is a prime, $x < 100\}$
  3. $\{x : x$ is a digit$\}$
  4. $\{x : x$ is a vowel$\}$

Solution

Natural numbers form an infinite set; the others are finite.

Asked in: MH-SSC-9

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