I think this is right, just want to double check.(adsbygoogle = window.adsbygoogle || []).push({});

Cov(Y1+Y2, Ʃ n i=2 Yi)= Cov(Y1, Ʃ n i=2) + Cov(Y2, Ʃ n i=2 Yi) = 0 + Var(Y2) = σ^2

is this right?

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# Can you check this covariance?

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