A) $ f(x)=logx,x>0 $
B) $ f(x)=e^{x},x\in R $
C) $ f(x)=x-[x],x\in R $
D) $ f(x)=x+[x],x\in R $
Correct Answer: C
[c] $ f(x)=logx $ is not periodic.; $ f(x)=e^{x} $ , is not periodic. $ f(x)=x-[x]={x}, $ has period $ 1;f(x)=x+[x] $ , is not periodic.
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