Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Bijective
   2. Reflexive
   3. Symmetric
   4. Transitive

   Odd item

   Bijective

2. Items

   1. Injective
   2. Symmetric
   3. Surjective
   4. Bijective

   Odd item

   Symmetric

3. Items

   1. Empty relation
   2. Universal one
   3. One-one map
   4. Trivial relation

   Odd item

   One-one map

4. Items

   1. Reflexive
   2. Symmetric
   3. Transitive
   4. Invertible

   Odd item

   Invertible

Instructions

Tap the item that does not belong with the rest.

Explanation