Hi, grammar books say both are ok, it just depends on what grammar book you look in, LOL. In my opinion, the plural is the most common choice by far. In formal contexts, you might find that someone also uses the singular.
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Philip[If 'one' is singular, how can 'none' be plural?Because 'none' is not 'one' (0 does not equal 1), therefore 'none' is not singular. If it's not singular, it must be plural. There's no other choice!