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Which of the following list of numbers form an AP? 
 
(i) \(4, 10, 16, 22, . . .\) is
 
(ii) \(1, – 1, – 3, – 5, . . .\) is
 
(iii) \(– 2, 2, – 2, 2, – 2, . . .\) is
 
(iv) \(1, 1, 1, 2, 2, 2, 3, 3, 3, . . .\) is
Answer variants:
not an Arithmetic progression
an Arithmetic progression