Which of the following sequence is an arithmetic sequence

1.	Which of the following sequence is an arithmetic sequence
A.	\[f(n)=an+b;\,n\in N\]
B.	\[f(n)=k{{r}^{n}};\,n\in N\]
C.	\[f(n)=(an+b)\,k{{r}^{n}};\,n\in N\]
D.	\[f(n)=\frac{1}{a\left( n+\frac{b}{n} \right)};\,n\in N\]
Answer» B. \[f(n)=k{{r}^{n}};\,n\in N\]

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Which of the following sequence is an arithmetic sequence

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