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How to pick randomly elements from a vector without repetation?

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IBM watson
IBM watson on 22 Oct 2018
Edited: Bruno Luong on 22 Oct 2018
If I have a vector like this :
a=[1 2 3 4 5]
i know how to do this but my vector is something like:
a=[23 46 4 2 5]
I should pick 2 elements randomly without repetation.


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