(iv) a = – 1, \(d=\frac{1}{2}\)
(v) a = – 1.25,  d = – 0.25
3. For the following APs, write the first term and the common difference:
(i) 3, 1, – 1, – 3, . . .
(ii) – 5, – 1, 3, 7, . . .
(iii) \(\frac{1}{3}, \frac{5}{3}, \frac{9}{3}, \frac{13}{3}, …\)
(ii) \(2, \frac{5}{2}, 3, \frac{7}{2}, …\)
(iii) -1.2, -3.2, -5.2, -7.2, …
(v) 3, \(3+\sqrt2\), \(3+2\sqrt2\), \(3+3\sqrt2\), …Â
(vi) 0.2, 0.22, 0.222, 0.2222, …
(viii) \(-\frac{1}{2}, -\frac{1}{2}, -\frac{1}{2}, …\)
(ix) 1, 3, 9, 27, …..   Â
(x) a, 2a, 3a, 4a, ….       Â
(xii) \(\sqrt2, \sqrt8,\)\(\sqrt{18}, \sqrt{32}, …\)
(xiii) \(\sqrt3, \sqrt6, \sqrt9, \sqrt{12}, …\)