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Question

If b,k are the intercepts of the focal chord of y2=4ax, ab then k is

A
abab
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B
abba
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C
2abba
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D
2abab
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Solution

The correct option is B abba
SP=b,SQ=k

These are the segments of focal chord

By focal chord property
1SP+1SQ=1a
1b+1k=1a
k=abba

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