I didn't mean to say this question is scandalous. It is a needlessly confusing question. No PIN I've ever heard of requires unique digits, and the question does

I didn't mean to say this question is scandalous. It is a needlessly confusing question. No PIN I've ever heard of requires unique digits, and the question does not actually have anything to do with PINs. If a CS student taking this test does not get “tricked” by this question, they should definitely be able to answer it.