Question

If $A=\{2,3\}$ and $B=\{1,2\}$, find $A\times B$.

• A. $\left\{\right(2,1),(2,2),(3,1),(3,2\left)\right\}$
• B. $\left\{\right(2,1),(2,1),(3,1),(3,2\left)\right\}$
• C. $\left\{\right(2,1),(2,2),(2,1),(3,2\left)\right\}$
• D. $\{2,1),(2,2),(3,1),(2,2)\}$

Answer 1

Answer: (A)

$\left\{\right(2,1),(2,2),(3,1),(3,2\left)\right\}$

$A=\{2,3\}$

$B=\{1,2\}$

$A\times B=\{2,3\}\times \{1,2\}$

$=\left\{\right(2,1),(2,2),(3,1),(3,2\left)\right\}$