insert zero in chosen column of matrix randomly

I have

A=[

     1     2     1     4
     3     4     1     4
     4     5     1     5
     5     7     1     6
     7     9     1     9];
 

I want to put zero for only one entery in column 3 randomly.

result shoud be

A=[

     1     2     0     4
     3     4     1     4
     4     5     1     5
     5     7     1     6
     7     9     1     9];
 or
 A=[

     1     2     1     4
     3     4     1     4
     4     5     0     5
     5     7     1     6
     7     9     1     9];
 or 
 
 A=[

     1     2     1     4
     3     4     1     4
     4     5     1     5
     5     7     1     6
     7     9     0     9];

Answer 1

[madhan ravi]

ix = 1:2:size(A,1);
A(ix(randi(numel(ix),1)),3)=0