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Using Wolframalpha or inline free format you can obtain a nice representation of a sum of vectors. An example is shown below. Whish is the hidden code? (or a code that make the same representation). I can make it using Graphics and Arrow but is too long, I suppose there is a easy way to do it. I think in one of the last Mathematica version has been included a build-up function to make it.

= plot vector(1,1) + vector(2,3)

enter image description here

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WolframAlpha["plot vector(1,1)+vector(2,3)", {{"Result", 1}, "Content"}]

enter image description here

To see the code behind you can take the first Part:

WolframAlpha["plot vector(1,1)+vector(2,3)", {{"Result", 1}, "Content"}][[1]]

enter image description here

To get the main graphics, use

WolframAlpha["plot vector(1,1)+vector(2,3)", {{"Result", 1}, "Content"}][[1, 1, 
   1, 1, 1]] // RawBoxes

enter image description here

and to get the legend use

WolframAlpha["plot vector(1,1)+vector(2,3)", {{"Result", 1}, "Content"}][[1, 1, 
   1, 1, 2]] // RawBoxes

enter image description here

To get the result pane with special styling, use

WolframAlpha["plot vector(1,1)+vector(2,3)", IncludePods -> "Result", 
 AppearanceElements -> {"Pods"}]

enter image description here

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