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How do I draw just a tree with one child using tikzpicture?
As shown in the picture, I want to have a tree like (1).
But I have only been succesful in getting a picture like (2) and (3) using:
\begin{tikzpicture}
\node[circle,draw](z){$30$}
% comment the below for (3):
child{}
child{
node[ci...