n $P(X_1,X_2)$
    is a multivariate Gaussian, and calculate its covariance matrix.<br />

2.  Prove by induction that the joint distribution for a general linear
    Gaussian network on $X_1,\ldots,X_n$ is also a
    multivariate Gaussian.<br />
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        <a href='#' class="p-2">Exercise 14.11</a>
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