So nan is an undefined value but its still considered a number? I got the answer wrong on the quiz. And I cant understand the logic behind it.
You could check out this article for more reference. https://javascriptrefined.io/nan-and-typeof-36cd6e2a4e43#:~:text=By%20definition%2C%20NaN%20is%20the,undefined%20as%20a%20real%20number%20.
Hope this helps. 
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