Which of the following sequence is an arithmetic sequence
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
$f(n) = \frac{1}{{a\left( {n + \frac{b}{n}} \right)}};\,n \in N$
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