... a red herring ... is a clue which makes you come to a wrong conclusion or something which looks like a clue but isn't.
What Is Red Herring?
A red herring is an artificial distraction from the essence of the problem. A red herring is a superficial and redundant piece of information that often complicates the formulation and obscurs the nature, of the problem. This could be a valuable device of problem posing that forces the solvers to investigate the problem first, separate what's important from what is not, and focus on the former.
Below are several examples.
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