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Annoying Little Problem

I'm having an annoying little problem with version I wrote the 
following info in a notebook and ran it:

v2 = {4, 0, -6}
N[Sqrt[v2.v2], 3]

Now the third line gives me 7.2111 but the fourth line gives me the 
same instead of 7.21. Does anyone have any idea what may be the problem? 
Am I doing something wrong?

Nalanji Dreaming

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