Note that I didn't downvote you. I actually consider the answer wrong too, and the professors agreed too. One of them said: "Obviously the student doesn't understand the problem."
I thought to myself: "You understand the problem because you know the answer." But I held my tongue.
But at the present state of the art, the student has no idea why the answer is wrong. That's where I think their high school math background failed them.
The danger of always using nice numbers! I've taught topics where I thought I had the best lecture, the best examples and that it would be impossible for a student to misinterpret the method. Some still did come up with flawed thinking. It's hard.
I thought to myself: "You understand the problem because you know the answer." But I held my tongue.
But at the present state of the art, the student has no idea why the answer is wrong. That's where I think their high school math background failed them.