Leebo
at 2019-01-20 10:14:32 UTC
Because it's 大人数 (large number of people) and not おとなずう, which I'm not sure what that would be.
Miwa Admin
at 2019-01-24 00:27:40 UTC
Because 大人数 = 大 + 人数, not 大人 + 数.
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おおにん
WHY IS IT おおにん INSTEAD OF おとな!!!!!!