The energy of orbitals depends on the principal quantum number or the main shell to a large extent. Hence, orbitals with an equal value of n will have the same levels of energy and will be called degenerate orbitals.
Amongst the given orbitals the degenerate orbitals will be 3dxy, 3dz2, 3dyx because they have the same main shell n = 3.
And 4dxy, 4dyx, 4dzz because they have the same value of n=4.
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