Teaching DSSSB TGT Mock Test 2025 Mathematics Relations and Functions

निम्नलिखित में से कौन-सा फलन f: R → R एकैकी फलन है?

1
f(x) = |x|, ∀ x ∈ R
2
f(x) = x2, ∀ x ∈ R
3
f(x) = - x, ∀ x ∈ R
4
इनमें से कोई नहीं 
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