Quick picks on relations

Exercise and reference answers

Questions

1. Question

   A relation relating nothing at all is:

   Choices

   1. Empty
   2. Universal
   3. Reflexive

   Correct choice

   Empty

2. Question

   One-one and onto together make a function:

   Choices

   1. Injective
   2. Bijective
   3. Surjective

   Correct choice

   Bijective

3. Question

   Equivalence needs reflexive, symmetric and:

   Choices

   1. Injective
   2. Invertible
   3. Transitive

   Correct choice

   Transitive

4. Question

   Another name for an onto function is:

   Choices

   1. Surjective
   2. Injective
   3. Reflexive

   Correct choice

   Surjective

5. Question

   An invertible function must be:

   Choices

   1. Onto only
   2. One-one and onto
   3. One-one only

   Correct choice

   One-one and onto

Instructions

Tap the correct answer before the round moves on.

Explanation