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                  <h1>Ex. 3.6</h1>
                
                <details class="question" open="open"><summary>Ex. 3.6</summary><p>Show that the ridge regression estimate is the mean (and mode) of the posterior distribution, under a Gaussian prior <span class="arithmatex">\(\beta\sim N(0,\tau\textbf{I})\)</span>, and Gaussian sampling model <span class="arithmatex