A uniform metal disc of diameter 24 cm is taken and out of it a disc of diameter 8 cm is cut off from the right side end. The centre of mass of the remaining part will be at :

Question

$\begin {array} {1 1} (1)\;Left\: side,\:2 \: cm\: from\: the\: centre & \quad (2)\;Right\: side,\:1 \: cm\: from\: the\: centre \\ (3)\;Right\: side,\:2 \: cm\: from\: the\: centre & \quad (4)\;Left\: side,\:1 \: cm\: from\: the\: centre \end {array}$