Question

Let $A=\{1,2,3,4\}$ and $B=\{1,2,\{1,2\left\}\right\}$. Then $\{1,2\}\subset B$.

• A. True
• B. False

Answer 1

The correct option is A True

Given,

$A=\{1,2,3,4\}$ and $B=\{1,2,\{1,2\left\}\right\}$.

Now the subsets of $B$ are $\varphi ,\left\{1\right\},\left\{2\right\},\left\{\right\{1,2\left\}\right\},\{1,2\},\{1,\{1,2\left\}\right\},\{2,\{1,2\left\}\right\},\{1,2,\{1,2\left\}\right\}$.

So $\{1,2\}$ is a subset of $B$.