Question

Classify the following set as 'singleton' or 'empty': $B=\{y|y$ is an odd prime number $<4\}$

• A. Singleton
• B. Empty
• C. Data insufficient
  
• D. None of these
  

Answer 1

The correct option is A Singleton

Odd prime number less than $4$ are $2$ and $3$ but $3$ is only odd prime less than $4$
$\therefore B=\left\{3\right\}$
Clearly, B is singleton set.