Find the first term and common difference of the Arithmetic Progressions whose nth terms are given below

(ii) tn = 4 - 7n

Solution :

To find the 1st term of the sequence, we have to apply n = 1.

d = t2 - t1 = -10 - (-3) = -10 + 3 ==> d = -7

Hence the first term and common difference are -3 and -7 respectively.