For the following APs, write the first term and the common difference:

For the following APs, write the first term and the common difference:
(i) 3, 1, -1, -3, ……
(ii) -5, -1, 3, 7, ……
(iii) $\frac { 1 }{ 3 }$ , $\frac { 5 }{ 3 }$ , $\frac { 9 }{ 3 }$, $\frac { 13 }{ 3 }$ , ………
(iv) 0.6, 1.7, 2.8, 3.9, …….