How to find Horizontal Asymptote of Rational Function?

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As my parent's wish to get employed in State Government. I started preparing for government exams. In order to get selected, I need to get ready for aptitude test. In all government exams, aptitude will be the first test.

In aptitude round, Horizontal and Vertical Asymptote is an important topic. I have searched in website for the solution. Now I came to know about Vertical Asymptote from https://www.easycalculation.com/analytical/vertical-asymptote.php. It gives the clear idea about how to solve with the formula.

Can anyone explain about the Horizontal Asymptote of Rational Function? It will be helpful for my competitive exams...

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