Question

Let $u=\begin{bmatrix} 1 \\\ 2 \\\ 3 \\\ 4 \\\ 5 \end{bmatrix}$, and let σ1, σ2, σ3, σ4, σ5 be the singular values of the matrix M= uuT (where uT is the transpose of u).The value of $Σ^{5}_{i=1}σ_i$ is

Answer 1

The correct answer is 55.