$\{x : x \in \mathbb{N},\ x < 1\}$ is

$\{x : x \in \mathbb{N},\ x < 1\}$ is
  1. an empty set
  2. a singleton set
  3. a finite set with $1$ element
  4. infinite

Solution

There is no natural number less than $1$, so the set is empty: $\emptyset$.

Asked in: MH-SSC-9

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