For the following A.P.s, write the first term a and the common difference d. (i) 3, 1, -1, -3, .... (ii) (iii) -3.2, -3, -2.8, -2.6, ...

(i) First term = a = 3 and common difference = d = 1 - 3 = -2. (ii) First term = a = and common difference = d = . (iii) First term = a = -3.2 and common difference = d = -3 - (-3.2) = 0.2.