If a, b, c are in A.P., show that, `(bc)/(a(b+c)), (ca)/(b(c+a))` and `(ab)/(c(a+b))` are in H.P.

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If a, b, c are in A.P., prove that : (ab+ac)/(bc), (bc+ba)/ (ca), (ca+cb)/(ab) are also in A.P.

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