Question: Is there a variance formula for 4 variables? For example, for 3 variables, it is: Var(A+B+C) = var(A) + var(B) + var (c) + 2cov(AB)

Is there a variance formula for 4 variables? For example, for 3 variables, it is: Var(A+B+C) = var(A) + var(B) + var (c) + 2cov(AB) + 2cov(BC) + 2cov(CA)

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