Solve this: If a, b, c are in A.P , then find value of $\frac{a-b}{b-c}$.

Dear Student,

Your Question is not clear and appears to be incomplete as what is to be proved is not clear. Kindly repost the question again.

Regards,

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i am not able to get what we have to prove....write it properly......BTW 1st step is correct
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