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If a, b, d and p are distinct non - zero...

If a, b, d and p are distinct non - zero real numbers such that `(a^2+b^2 + c^2) p^2 - 2(ab+bc+cd)p+(b^2 + c^2 +d^2) le 0` then n. Prove that a, b, c, d are in G. P and ad = bc

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