Which of the following sequences are A.P...

Which of the following sequences are A.P.? If it is an A.P., find next two terms.
(i) 5,12,19,26,…….
(ii) `2,-2, -6, -10`……….
(iii) `1,1,2,2,3,3`……
(iv) `3/2, 1/2, -1/2`,………….

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