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Which of the following are APs ?
 
(i) a, a^2, a^3, a^4, . . . is
 
(ii) \sqrt{2}, \sqrt{8}, \sqrt{18}, \sqrt{32},.. is
 
(iii) \sqrt{3}, \sqrt{6}, \sqrt{9},\sqrt{12},... is
 
(iv) 1^2, 3^2, 5^2, 7^2, . . . is
 
(v) 1^2, 5^2, 7^2,73,... is
 
Answer variants:
not an Arithmetic progression
an Arithmetic progression