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Please explain and give some details. Thank you! Precisely when does V(X+Y) = V(X) + V(Y) Precisely when does V(X+Y) V(X) + V(Y)?

Please explain and give some details. Thank you!

Precisely when does V(X+Y) = V(X) + V(Y)

Precisely when does V(X+Y) V(X) + V(Y)?

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