Topic explanation

Standard explanation

Example: 2, 5, 8, 11, ... might be an = 3n-1. Index n usually starts at 1 in school. Recurrence: a{n+1} from a_n (later AP/GP).

Key points

• nth term
• sequence = list
• series = sum of the list
• term vs sum
• SEQUENCES AND NTH TERMS: Example: 2, 5, 8, 11, ... might be an = 3n-1. Index n usually starts at 1 in school. Recurrence: a
• SEQUENCE: Example: 2, 5, 8, 11, ...
• WHAT — SEQUENCES AND NTH TERMS: Example: 2, 5, 8, 11, ... might be an = 3n-1. Index n usually starts at 1 in school. Recurrence: a
• WHY — Why it matters: This rule is a separate learning unit inside sequences and the general term. It can be defined, appl

Labelled diagram