medium · Quantitative Finance

What is the result of the matrix product w^top Σ w if Σ is a 3 × 3 matrix and w is a 3 × 1 vector?

  1. A 1 × 3 row vector
  2. A 3 × 3 matrix
  3. A 3 × 1 column vector
  4. A scalar (real number)

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