Question

The following is singleton set or not.
$A=\{x:x\in R;(x-1{)}^2=0\}$

• A. True
• B. False

Answer 1

The correct option is A True

$A=\{x:x\in R;(x-1{)}^2=0\}$
$=\{x:x\in R;x=1,1\}$
$=\left\{1\right\}$
So, $A$ is a singleton set.