The unintuitiveness of how many combinations you can get from such a small amount of items is why the birthday &quot;paradox&quot; is so interesting.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Birthday_problem" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Birthday_problem</a>