Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Two by three
   2. One by one
   3. Two by two
   4. Three by three

   Odd item

   Two by three

2. Items

   1. Minor
   2. Cofactor
   3. Adjoint
   4. Frustum

   Odd item

   Frustum

3. Items

   1. Area of triangle
   2. Inverse of matrix
   3. Solving systems
   4. Melting a candle

   Odd item

   Melting a candle

4. Items

   1. A number
   2. Real or complex
   3. Unique value
   4. A whole matrix

   Odd item

   A whole matrix

Instructions

Tap the item that does not belong with the rest.

Explanation