MCQ
निम्न में से कौन-सा फलन आच्छादक है-
- A$f: Z \rightarrow Z, f(x)=|x|$
- B$f: N \rightarrow N , f(x)=|x|$
- ✓$f: R _0 \rightarrow R ^{+}, f(x)=|x|$
- D$f: C \rightarrow R , f(x)=|x|$
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