This answer is not correct. I think that you are thinking that large groups should be in equatorial positions but this is dependent on the geometric positioning of the groups. The best way to solve this problem is to draw the compound in a Haworth projection and then assign the largest group as an equatorial position (Haworth projections do not show axial-equatorial positions). Then remember that the axial-equatorial positions alternate across the top and bottom of the ring as shown...