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Sum components of a vector in Wolfram|Alpha?

Posted 8 years ago
u={1,2,3} ; Sum[u]

This isn't giving 6: http://www.wolframalpha.com/input/?i=u%3D%7B1,2,3%7D+;+Sum%5Bu%5D

I think I'm doing it right: Sum

What gives?

POSTED BY: pi tao
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