1,2,2,3,4,4,4,5,5,5,5,6,6,6,6,7,7,8,9,9
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1,2,2,3,4,4,4,5,5,5,5,6,6,6,6,7,7,8,9,9
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Answer:
no an AP
Step-by-step explanation:
Because the common difference ia not same.