The strongest intermolecular force between Xe and NH3 is dipole-induced dipole interaction.
NH3 is a polar substance. The molecule has a dipole moment therefore there exists dipole - dipole interaction within the molecule.
In addition to that, nitrogen is bonded to hydrogen which leads to extensive hydrogen bonding in NH3.
On the other hand, Xe is a noble gas and the strongest interaction between Xe particles are dispersion forces.
However, when Xe is combined with NH3, the two interact via dipole-induced dipole interactions.
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