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Could you please tell me which sentence is correct ?

That is just one of many problems.
That is just one among many problems.
That is just one of among many problems.

Thank you.
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Hi Candy, welcome to the forums..

I'd say 1 & 2, but I think 3 might also be correct (not completely sure)
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The three are correct though the first one is more common.
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Hi, everyone!
Thank you for answering my questions Emotion: smile
I'm still new here, so I might often ask you strange questions.
In that case, please help me.
I enjoy EnglishForward very much, and I am very happy to have joined here recently.

So, it seems all of them are correct?
According to a friend of mine, "of among" is commonly used in America.
Does anyone know about this?

To avoid making mistakes, I think I'll use "of" or "among" in my English.