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Question
Which of the following form an AP? Justify your answer.
–1, –1, –1, –1,...
Solution
We have a1 = – 1, a2 = – 1, a3 = – 1 and a4 = – 1
a2 – a1 = 0
a3 – a2 = 0
a4 – a3 = 0
Clearly, the difference of successive terms is same,
Therefore, given list of numbers from an AP.
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