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
Solution :
[c] if \[n=0,\] then h(n) is not defined, so, ?h? is not a function. All other are functions. .
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