Unit 14 · Class 9 IB MYP · Formula Sheet

Sequences & Series Formulas — Class 9 IB MYP

Identify arithmetic and geometric sequences; find nth terms and partial sums.

Key Formulas

AP nth Term

u_n = u_1 + (n-1)d

AP Sum

S_n = \dfrac{n}{2}(u_1 + u_n)

GP nth Term

u_n = u_1 \cdot r^{n-1}

GP Sum (finite)

S_n = \dfrac{u_1(1 - r^n)}{1 - r}

Worked Examples

1Using: Application

Apply the key formula from this topic to a sample problem.

Step 1: Identify the formula.

Step 2: Substitute the values.

Step 3: Simplify to get the answer.

Answer: See solution above

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More Class 9 IB MYP Formulas

Real Number SystemQuadratic ExpressionsCoordinate GeometryLinear & Non-Linear FunctionsCircle GeometryTrigonometry Introduction

Frequently Asked Questions

How many formulas are in Class 9 IB MYP Sequences & Series?+
There are 4 formulas in the Sequences & Series chapter for Class 9 IB MYP. Each formula is essential for solving problems in this topic.
How to remember Sequences & Series formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Sequences & Series formulas enough for exams?+
Yes, these formulas cover the complete IB MYP Class 9 syllabus for Sequences & Series. Practice applying them to different types of questions for full exam readiness.

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