(adsbygoogle = window.adsbygoogle || []).push({}); how to calculate rank of 2 by 1 matrix..??

hey guys so i am well familiar with finding out rank of square matrices but if matrix is just a row or column vector then how to determine its rank..considering the example below:

a=[x1

x2

x3]

where is column matrix while x1,x2,x3 are elements of this matrix..!!

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# How to calculate rank of 2 by 1 matrix?

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