If the first, second and last terms of a...

If the first, second and last terms of an arithmetic series are a,b and c respectively , then the number of terms is

A

`(b+c-2a)/(b-a)`

B

`(b+c+2a)/(b-a)`

C

`(b+c-2a)/(b+a)`

D

`(b+c+2a)/(b+a)`

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The correct Answer is:

A

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