title: Better way to sum rows
body: <p>I'm learning F# (again) and I'm trying to sum some rows in excel. This is my attempt.</p>
  
  <pre><code>let sumRows (source: seq&lt;double[]&gt;) =
      source
      |&gt; Seq.reduce (fun a b -&gt; (a, b) ||&gt; Seq.map2 (fun x y -&gt; x + y) |&gt; Seq.toArray)
  </code></pre>
  
  <p>Can it be done better? I already discovered double forward pipe operator, but now, whole part <code>fun a b -&gt; (a, b) ||&gt;</code> seems quite redundant...</p>