I got this question in Quiz 19 in the Math For Video Games course. Surely the conjugate is supposed to be: 4 - 1i - 2j - 3k
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Thank you for bringing this to my attention.
You are absolutely right - the answer should be 4 - 1i - 2j - 3k.
This was raised a while ago and I was under the impression that it had been fixed. I’ve now corrected the answer but if you notice any other errors then please do let me know (feel free to @ me in those cases).