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The abscissa of the three points P , Q ,...

The abscissa of the three points P , Q , R of an ellipse, one of whose focus is S , are in A.P . Prove that the focal distances of the three points are also in A.P .

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Which shows that `overline (SP) ,overline (SQ)` and `overline(SR)` are in A . P . i.p., the focal distances of P , Q and R in A . P .
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