- #1

- 63

- 0

-1 1 1 1 1

1 -1 1 1 1

1 1 -1 1 1

1 1 1 -1 1

1 1 1 1 -1

the matrix is all 1's with -1's on the main diagonal, im not sure if i should row reduce until i have an upper triangular matrix and use product of diagonal entries or if there is a simple trick im missing