if a, b, c, are in AP or GP or BP, then a-b/b-c is equal to
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When a, b, c are Ap
=a-b/b-c
=-(b-a/c-b)
=b-a/c-b
=d/d
=1
=a-b/b-c
=-(b-a/c-b)
=b-a/c-b
=d/d
=1
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