Matrices

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Across
  1. 2. For a 2x2 matrix, ad - bc gives
  2. 4. When a matrix is multiplied by its inverse, the result is this
  3. 6. A matrix which has an equal number of rows and columns
  4. 7. A matrix which has no inverse
Down
  1. 1. A collection of numbers in fixed columns and rows
  2. 3. AB is not equal to BA
  3. 5. A matrix with no inverse has a determinant equal to