Question

20.which of the following is not an A.P. *



= 6,4,2,0.......

= 2,2,2,2.....

= x, 2x ,3x, 4x,......

none of these
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Answer 1

Answer:

none of these

Step-by-step explanation:

in first d =  -2

in second d=0

in third d = 2x-x

           = x  

so,conclusion is that all given terms are AP

Answer 2

Answer:

none of these

Step-by-step explanation:

as all are in AP

1)common difference= -2

2) common difference=0

3) common difference=x