Question
Find the first term and common difference for each of the A.P.
5, 1, – 3, – 7, . . .
5, 1, – 3, – 7, . . .
✓
Answer
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
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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