Скачать или смотреть IB High School Math Tips #66

IB Math Tip 📘 | nth Term Rule (Arithmetic Sequences)

Given the sequence:
7, 11, 15, 19, ...

Step 1: Find the common difference
d = 11 − 7 = 4

Step 2: Use either nth-term formula

Method 1 (IB-friendly):
Tₙ = dn + c
c = a − d = 7 − 4 = 3
So, Tₙ = 4n + 3

Method 2 (standard form):
Tₙ = a + (n − 1)d
Tₙ = 7 + (n − 1) × 4
Tₙ = 4n + 3 ✔

Key idea:
Different formulas, SAME rule.

Perfect for:
• IB & IGCSE students
• Grade 8–10 algebra
• Exam sequence questions

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