Determinant of Inverse

Problem

Compute the determinant of the inverse of a 2x2 matrix A using

det(inv(A)) = 1 / det(A)

Return None if det(A) == 0.

Hint

Invertible matrices have nonzero determinant.

case 1

in: [[[1,2],[3,4]]]

expected: -0.5

case 2

in: [[[2,0],[0,4]]]

expected: 0.125

case 3

in: [[[4,7],[2,6]]]

expected: 0.1

case 4

in: [[[1,2],[2,4]]]

expected: null

Starter codePython

def det_inverse(A):
    # Your code here
    pass

4 test cases · run your code against them in the editor