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प्रश्न
Which of the following form an AP? Justify your answer.
1, 1, 2, 2, 3, 3,...
उत्तर
We have a1 = 1 , a2 = 1, a3 = 2 and a4 = 2
a2 – a1 = 0
a3 – a2 = 1
Clearly, the difference of successive terms is not same
Therefore given list of numbers does not form an AP.
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