210 divided by 42 is 5, so the correct answer set is [A,C,D,E] rather than [A,C,D]. 42 doesn't use the factor of 3 twice. Is a set of errata posted somewhere online?
Thank you for your inquiry, Jason. I've forwarded it onto our editorial team for review.
Currently, there is not published errata for this title.
Sincerely,Tom with Wiley
Retrieving data ...