Seventh one in the series, this blog post is a problem about the chances that two multiple choice answer sheets could have many answer the same, including the wrong ones.

Sixth one in the series, this blog post has a problem about coronavirus, mutation, and the theoretical number of genetically different coronaviruses.

Fifth one in the series, this blog post has a few different problems about the growth of funds in a bank account, devaluation of vehicles, COVID-19 case projections, and growth rate.