Disc of radius a/2 is cut from disc of radius a. Find x-co-ordinate of COM from origin.

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Disc of radius $a\over2$ is cut from disc of radius a. Find x-co-ordinate of COM from origin.

(1) $5a\over6$

(2) $a\over6$

(3) $a\over3$

(4) $a\over2$