I won`t be answering the quiz - but wanted to comment on this;
Quote:
Originally Posted by ryuurui
I believe that じゃん is the old Aichi pref. local dialect (三河弁（みかわべん). It somehow migrated to Tokyo through Yokohama.
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You might want to look into who founded Tokyo(Edo), and where all the people they brought with them were from.
In 三河弁, the use is a lot heavier. It comes in double sets of ん endings, like わからんじゃん, おらんじゃん, etc. じゃんか, じゃんね, and じゃんな are also pretty common.
I almost never heard a ない ending in casual speech until I moved. It was all ん.
Only one of my friends, who`d moved there from elsewhere used the んない pattern. (Like わかんない) It really stood out.