title: Calculate product with LINQ
body: <p>I am learning LINQ and have a very simple question that I think will help my understand the technology better. How can I find the product of an array of ints?</p>
  
  <p>For example, what is the LINQ way to do:</p>
  
  <pre><code>int[] vals = { 1, 3, 5 };
  return vals[0] * vals[1] * vals[2];
  </code></pre>