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The variance of a portfolio of risky securities (a)is a weighted sum of the securities' variances. (b)is the sum of the securities' variances. (c)is the

The variance of a portfolio of risky securities

(a)is a weighted sum of the securities' variances.

(b)is the sum of the securities' variances.

(c)is the weighted sum of the securities' variances and covariances.

(d)is the sum of the securities' covariances.

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