Solve this:
If a, b, c are in A.P , then find value of  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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What are you looking for?