I read a the following link with state that the Qualitative Research does't have Variables.

https://faculty.unlv.edu/pjones/rmqual.htm

If you don't agree with this academic site so, what is the variables in the following research problem:

1- What is the formulation for the research problem which find out the binary search algorithm.

2- What is the formulation for the research problem which solve shortest path problem algorithm.

3- What is the solution of mathematical equation.

generally find a way to solve a know problem may not required variables.

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