Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Natural number
   2. Real part
   3. Imaginary part
   4. Conjugate

   Odd item

   Natural number

2. Items

   1. Real axis
   2. Imaginary axis
   3. Argand plane
   4. Number line

   Odd item

   Number line

3. Items

   1. Euler
   2. Hamilton
   3. Ordered pair
   4. Pythagoras

   Odd item

   Pythagoras

4. Items

   1. At least one root
   2. n roots, degree n
   3. The main theorem
   4. No roots at all

   Odd item

   No roots at all

Instructions

Tap the item that does not belong with the rest.

Explanation