Question

What is the power of a singleton set?

• A. $0$
• B. $2$
• C. $1$
• D. $4$

Answer 1

The correct option is B $2$

Power of a singleton set $=2^1=2$
Since, Singleton set has only one element.
Example: Let $A=\left\{a\right\}$
$P\left(A\right)=\{\varphi ,\{a\left\}\right\}$