Spot the one that does not belong

Exercise and reference answers

Questions

1. Items

   1. Row matrix
   2. Diagonal matrix
   3. Scalar matrix

   Odd item

   Row matrix

2. Items

   1. A′ = A
   2. A′ = I
   3. A′ = −A

   Odd item

   A′ = I

3. Items

   1. (A + B)′ = A′ + B′
   2. (kA)′ = kA′
   3. (AB)′ = A′B′

   Odd item

   (AB)′ = A′B′

4. Items

   1. Rectangular
   2. Symmetric
   3. Skew symmetric

   Odd item

   Rectangular

Explanation