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Question
Which of the following sequences are in arithmetic progression?
15, 12, 9, 6, .....
Solution
15, 12, 9, 6, .....
d1 = 12 – 15 = – 3
d2 = 9 – 12 = – 3
d3 = 6 – 9 = – 3
Since d1 = d2 = d3, the given sequence is in arithmetic progression.
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