Which of the following series of numbers is not an A.P. ?
(i) – 3, - 2, - 1, 0, .
(2) 4, 4, 4, 4, 4, .
(3) 100, 70, 40, 10, ..
(4) 8, 6, 3, 10, 12, .....
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4
in first ,second and third the common difference is same.. but in 4th series, the common difference is different. therefore it is not an AP
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