Question

Let $A=\{1,2,4\},B=\{2,4,5\},C=\{2,5\}$, then $(A-B)\times (B-C)$ is

• A. $\left\{\right(1,2),(1,5),(2,5\left)\right\}$
• B. $\left\{\right(1,4\left)\right\}$
• C. $\left\{\right(4,1\left)\right\}$
• D. $\varphi$

Answer 1

The correct option is B $\left\{\right(1,4\left)\right\}$

$A-B=\left\{1\right\}B-C=\left\{4\right\}\therefore (A-B)\times (B-C)=\left\{\right(1,4\left)\right\}$