If $S = \{x : x \in \mathbb{N},\ x$ is a factor of $12\}$, the cardinality of $S$ is

If $S = \{x : x \in \mathbb{N},\ x$ is a factor of $12\}$, the cardinality of $S$ is
  1. $6$
  2. $4$
  3. $5$
  4. $12$

Solution

Factors of $12$: $1, 2, 3, 4, 6, 12$ — six factors.

Asked in: MH-SSC-9

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