MCQ
Which of the following sequence is an arithmetic sequence
- ✓$f(n) = an + b;\,n \in N$
- B$f(n) = k{r^n};\,n \in N$
- C$f(n) = (an + b)\,k{r^n};\,n \in N$
- D$f(n) = \frac{1}{{a\left( {n + \frac{b}{n}} \right)}};\,n \in N$
Putting $n = 1,\;2,\;3,\;4,\;..........,$ we get the sequence
$(a + b),\;(2a + b),\;(3a + b),.........$ which is an $A.P.$
Where first term $(A) = (a + b)$ and common difference $d = a$.
Aliter : As we have mentioned in theory part that ${n^{th}}$ term of an $A.P.$ is of the form,
$an + b,\;\forall n \in N$.
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$S_2=\left\{z \in C: I m\left(\frac{z+1-\sqrt{3} i}{1-\sqrt{3} i}\right) \geq 0\right\}$ and
$\mathrm{S}_3=\{\mathrm{z} \in \mathrm{C}: \operatorname{Re}(\mathrm{z}) \geq 0\}$. Then