title: Calculating the e number using Raku
body: <p>I'm trying to calculate the <em>e</em> constant (<em>AKA Euler's Number</em>) by calculating the formula
  <img src="https://i.ibb.co/KXBJkf7/e.png" alt="e"> </p>
  
  <p>In order to calculate the factorial and division in one shot, I wrote this:</p>
  
  <pre><code>my @e = 1, { state $a=1; 1 / ($_ * $a++) } ... *;
  say reduce  * + * , @e[^10];
  </code></pre>
  
  <p>But it didn't work out. How to do it correctly?</p>