For the following A.P.s, write the first term ‘a’ and the common difference ‘d’: (i)

    \[\mathbf{3},\text{ }\mathbf{1},\text{ }\text{ }\mathbf{1},\text{ }\text{ }\mathbf{3},\text{ }\ldots \]

(ii)

    \[\mathbf{1}/\mathbf{3},\text{ }\mathbf{5}/\mathbf{3},\text{ }\mathbf{9}/\mathbf{3},\text{ }\mathbf{13}/\mathbf{3},\text{ }\ldots .\]