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If `(x _(a), y_(1))and (x_(2), (y_(2))` are the end points of a focal chord of the parabola `y ^(2) = 5x, ` then `4 x _(1) x_(2)+y_(1)y_(2)=`

A

25

B

5

C

0

D

`5/4`

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Verified by Experts

The correct Answer is:
C
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TARGET PUBLICATION-CIRCLE AND CONICS -COMPETITIVE THINKING
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