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Question

If PSQ is a focal chord of the ellipse x2a2+y2b2=1,a>b, then the harmonic mean of SP and SQ is

A
b2a
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B
a2b
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C
2b2a
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D
2a2b
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Solution

The correct option is A b2a
Since, length of semi latus rectum is harmonic mean of between the segment of any focal chord
Therefore, H.M.=2(SP)(SQ)SP+SQ=b2a

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