title: How can I calculate the number at a given row and column in Pascal's Triangle?
body: <p>I'm trying to create a function that, given a row and column, will calculate the value at that position in Pascal's Triangle.</p>
  <h3>Example:</h3>
  <pre><code>val = GetPasVal(3, 2); // returns 2
  </code></pre>
  <p>So here I'm specifying row 3, column 2, which as you can see:</p>
  <pre><code>          1
           1  1
         1   2   1
  </code></pre>
  <p>...should be a 2.</p>