A) $ f={(x,x)|x\in R} $
B) $ g={(x,3)|x\in R} $
C) $ h={(n,\frac{1}{n})|n\in I} $
D) $ t={(n,n^{2})|n\in N} $
Correct Answer: C
[c] if $ n=0, $ then h(n) is not defined, so, ?h? is not a function. All other are functions. .
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