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The equation of the chord of (x^(2))/...

The equation of the chord of `(x^(2))/(36)+(y^(2))/(9)=1` which is bisected at (2,1) is

A

`x+2y-4=0`

B

`x-2y+4=0`

C

`x+2y+4=0`

D

`-x+2y+4=0`

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The correct Answer is:
A
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