Videot aukeavat uuteen ikkunaan:
- Khan Academy "Arithmetis Sequences"
- Khan Academy "Geometris Sequences"
- Khan Academyn "Sequences and Series (part 1)", esim. sigma-merkin idea
- Khan Academyn "Sequences and Series (part 2)"
- TeacherTubeMath Sequences and Series (n. 37 min...!)
- Khan Academy "Arithmetic Sum"
- Khan Academy "Geometric Sum"

Kirjan tehtäviä:
- 728
- 731
- 740
- 742
- 805
- 810
- 821
- 828