Goldman, Lehman Post Strong Results  NEW YORK (Reuters) - Investment bank stocks rose strongly  Tuesday after Goldman Sachs Group Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GS.N target=/stocks/quickinfo/fullquote"&gt;GS.N&lt;/A&gt; and Lehman  Brothers Holding Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=LEH.N target=/stocks/quickinfo/fullquote"&gt;LEH.N&lt;/A&gt; reported surprisingly strong  third-quarter results, indicating that sluggish market  conditions this summer did not dent Wall Street earnings.