According to google search, "a newcomers" is used in many websites.
is it singular or plural?
And if it's plural, why do we add a in front of it?
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When I searched "a newcomers" (no apostrophe) newcomers was always being used as part of compound noun, eg. "a newcomers guide" = "a guide for newcomers".
Therefore the "a" is appropriate because it can refer to a singular noun, that is being described as for newcomers.