1.Set Theory
hard

$A$ and $B$ are two subsets of set $S$ = $\{1,2,3,4\}$ such that $A\ \cup \ B$ = $S$ , then number of ordered pair of $(A, B)$ is 

A

$72$

B

$81$

C

$16$

D

$96$

Solution

$3^4$

Standard 11
Mathematics

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