Q3 of 69 Page 61

Find the first term and common difference for each of the A.P.

5, 1, – 3, – 7, . . .

5, 1, – 3, – 7, . . .


First term a1 = 5


Second term a2 = 1


Third term a3 = – 3


We know that d = an + 1 – an


Thus, d = a2 – a1 = 1 – 5 = – 4


Hence, the common difference d = – 4 and first term is 5


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