Brainlag PlusSquare, cube and triangular numbers, Fibonacci-type sequences, and telling sequence types apart.
Sequences to know
- Square numbers 1, 4, 9, 16, ...: nth term n².
- Cube numbers 1, 8, 27, 64, ...: n³.
- Triangular numbers 1, 3, 6, 10, 15, ...: n(n + 1)/2 (the dots in a triangle).
- Fibonacci-type: each term is the sum of the two before. 1, 1, 2, 3, 5, 8, ... or 2, 5, 7, 12, 19, ...
The rest of this lesson and its 7 practice questions are in Plus.
Screen 1 of 2, free to read.
- 7 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards