\"Imagine, that you have an urn filled with 100 balls, some red and some green...\". Find the web-page \href{https://tetraquark.netlify.app/post/redballgreenball/redballgreenball/index.html?src=pdf}{here.}
We sometimes have to deal with very large and very small numbers in the same equation. This post looks into a probability calculation for an event which has very low success rate but repeats many times.