Question

Let $A=\{u,v,w,z\}$ and $B=\{3,5\}$, then the number of relations from $A$ to $B$ is

• A. $64$
• B. $256$
• C. $1024$
• D. $512$

Answer 1

The correct option is B $256$

Number of elements in $A=4$
Number of elements in $B=2$
$\therefore$ Number of relations $=2^{2\times 4}=256$