Consider sets A and B each having 4 elements. If $f: A→B$ be a function, then number of functions from A to B are :
Answer & explanation
Correct answer: option 2
Set $A$ has 4 elements and set $B$ has 4 elements.
Number of functions from $A$ to $B$ is given by $|B|^{|A|}$
$=4^{4}$
$=256$
Required number of functions = $256$