Which of the following in not an A ...

Which of the following in not an A .P .?

A

`-1.2,0.8,2.8,……`

B

`3.3,+sqrt(2),3+2sqrt(2),3+3sqrt(2) ,……`

C

`(4)/(3) ,(7)/(3),(9)/(3),(12)/(3),…`

D

`(-1)/(5),(-2)/(5) ,(-3)/(5) `

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