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We know the variance of three variables x1, x2,x3 and the covaraince (x1,x2) and covaraince (x2,x3)...

We know the variance of three variables x1, x2,x3 and the covaraince (x1,x2) and covaraince (x2,x3)

Is there a way to find the covariance between x1 and x3?

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