defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Relations and Functions Types of Relations
The function f : R → R, defined as f (x) = \(\left\{ {\begin{array}{*{20}{c}} {1, \ if\space x > 0}\\ {0,\ if\space x = 0}\\ { - 1,\ if\space x < 0} \end{array}} \right.\) is
1
Injective
2
Surjective
3
Neither Injective nor Surjective
4
Surjective and Injective