Of the two phrases:
- zero of one qualification
- zero of one qualifications
Because one is singular, it should be qualification without the plural suffix ‑s. But for reasons I cannot explain, to me it sounds better to use qualifications in the plural there.
Is there a correct choice here, or are both possibilities valid? Is it just that one is more common than the other? What tricks my ear or mind into thinking the peculiar zero or one qualifications “sounds” better? Should I go with my instinct here? Why or why not?