MATLAB: How to implement the following

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How to implement the following? a and b are selected at random. If the following conditions true it should go inside loop. else again we should wait till those conditions true.
a+b=1 and
0 <= a,b <= 1

Best Answer

if a + b == 1 && 0 <= a && b <= 1
%loop goes here
else
pause(inf); %"wait until those conditions are true"
end