The number of lone pairs of electrons on $Xe\: in\: XeF_2, XeF_4\: and \: XeF_6$ are, respectively

Question

$\begin {array} {1 1} (1)\;3,2,0 & \quad (2)\;2,3,1 \\ (3)\;4,3,2 & \quad (4)\;3,2,1 \end {array}$