Which set is **infinite**?
A$\{1, 2, 3, \ldots, 99, 100\}$
BThe set of months of a year
C$\{x : x \in \mathbb{N} \text{ and } x \text{ is prime}\}$
DThe set of solutions of $x^{2} = 16$
Answer & Solution
Correct answer: C. $\{x : x \in \mathbb{N} \text{ and } x \text{ is prime}\}$
Primes are infinite (Euclid). The other three have $100$, $12$, and $2$ elements respectively.
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