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applesauce

quick question about vector magnitude and zed3d

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i just started reading through zed3d, and i came across what i think is an error in the vector chapter's practice problems. but it's bothering me to the point that i don't know what to believe. so the question is, does |(3,4,20/3)| = 25/3 somehow? or is that wrong like i think? zed3d for reference: here it's exercise d) of the vector math section

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Google calculator says:
sqrt((3 * 3) + (4 * 4) + ((20 / 3) * (20 / 3))) = 8.33333333
The example appears to be correct.

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