SOLUTION: which operations is the following set closed under 2,4 or 6?

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Question 1066255: which operations is the following set closed under 2,4 or 6?
Answer by ikleyn(52884) About Me  (Show Source):
You can put this solution on YOUR website!
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WRONGLY WRITTEN CONDITION.

Double check it. Find the error. Fix it.

Then re-post.