Question

Let $A=\{1,2,3,4\}$ and $B=\{2,3,4,5,6\}$ then $A△B$ is equal to

• A. $\{2,3,4\}$
• B. $\left\{1\right\}$
• C. $\{5,6\}$
• D. $\{1,5,6\}$

Answer 1

The correct option is D $\{1,5,6\}$

We have,

$A=\{1,2,3,4\}$ and $B=\{2,3,4,5,6\}$

We know that,

$A\Delta B=(B-A)\cup (A-B)$

Therefore,

$A\Delta B=\{5,6\}\cup \left\{1\right\}$

$A\Delta B=\{1,5,6\}$

Hence, this is the answer.