Question
Write an A.P. whose first term is a and common difference is d in each of the following.
a = – 19, d = – 4
a = – 19, d = – 4
✓
Answer
a = – 19, d = – 4
Let a1 = a = – 19
Since, the common difference d = – 4
Using formula an + 1 = an + d
Thus, a2 = a1 + d = – 19 + ( – 4) = – 19 – 4 = – 23
a3 = a2 + d = – 23 + ( – 4) = – 23 – 4 = – 27
a4 = a3 + d = – 27 + ( – 4) = – 27 – 4 = – 31
Hence, An A.P with common difference – 4 is – 19, – 23, – 27, – 31,….
Let a1 = a = – 19
Since, the common difference d = – 4
Using formula an + 1 = an + d
Thus, a2 = a1 + d = – 19 + ( – 4) = – 19 – 4 = – 23
a3 = a2 + d = – 23 + ( – 4) = – 23 – 4 = – 27
a4 = a3 + d = – 27 + ( – 4) = – 27 – 4 = – 31
Hence, An A.P with common difference – 4 is – 19, – 23, – 27, – 31,….
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