List of top Mathematics Questions on Relations and functions asked in JKCET

Let $ R $ be a relation on set $ A $ such that $ R = R^{-1} $, then $ R $ is
Let $ R $ be a relation on $ \mathbb{N} $ defined as $ x R y $ iff $ x + 2y = 8 $, the domain of $ R $ is
Let $ f : x \to y $ be a given function, then $ f^{-1} $ exists if
If $ S=\{(a,\,b):b=|a-1|,a\in Z $ and $ |a|<3\}, $ where $Z$ denotes the set of integers. Then, the range set of $S$ is
The cartesian product $ A\times A $ has $9$ elements among which are found $ (-1,0) $ and $ (0,1), $ then set $A$ = ?
Which of the following is not a function?