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Given that $A$ is foot of $\perp$ of $P(a,b,c)$ on $yz$ plane and

$B$ is foot of $\perp$ drawn from $P$ on z$x$ plane.

$\therefore \:A\:\:and\:\:B$ are given by $A(0,b,c)$ and $B(a,0,c)$

Normal to the plane $OAB$ is given by $(0,b,c)\times(a,0,c)= (bc,ca,-ab)$

$\therefore$ The eqn. of the plane with normal $(bc,ca,-ab)$ and passing through $O(0,0,0)$ is

$bcx+cay-abz=0$

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