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प्रश्न
Which of the following sequences are in arithmetic progression?
5, 9, 12, 18, .....
उत्तर
5, 9, 12, 18, .....
d1 = 9 – 5 = 4
d2 = 12 – 9 = 3
Since d1 ≠ d2, the given sequence is not in arithmetic progression.
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