If P divides OA internally in the ratio lambda1 : lambda2 and Q divides OA externally in the ratio lambda1 : lambda2, then prove that OA is the harmonic mean of OP and OQ

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If P divides OA internally in the ratio lambda1 : lambda2 and Q divides OA externally in the ratio lambda1 : lambda2, then prove that OA is the harmonic mean of OP and OQ

If P divides OA internally in the ratio lambda1 : lambda2 and Q divides OA externally in the ratio lambda1 : lambda2, then prove that OA is the harmonic mean of OP and OQ

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If P divides OA internally in the ratio lambda1 : lambda2 and Q divides OA externally in the ratio lambda1 : lambda2, then prove that OA is the harmonic mean of OP and OQ

If P divides OA internally in the ratio lambda1 : lambda2 and Q divides OA externally in the ratio lambda1 : lambda2, then prove that OA is the harmonic mean of OP and OQ

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