Identify the flaw in the argument, Mathematics

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Identify the flaw in the following argument which supposedly determines that n² is even when n is an even integer. As well name the reasoning:

Assume that n² is even. After that n² = 2k for some integer k. Let n = 2l for some integer l. This depicts that n is even.

Ans: The flaw lies in the following statement "Let n = 2l for some integer l. This depicts that n is even". This is a loaded and biased reasoning. This can be hence proved by method of contradiction.

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