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From a point P perpendiculars PM and PN are drawn upon x, y axes respectively. If MN passes through a fixed point (a, b) then the locus of P is

A

`(x)/(a)+(y)/(b)=1`

B

`(x)/(a)-(y)/(b)=1`

C

`(a)/(x)+(b)/(y)=1`

D

`(a)/(x)-(b)/(y)=1`

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