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Formula Sheet

Probability — Formula Sheet

Tamil Nadu Board · Class 9 · Mathematics

5 formulas from Probability (Tamil Nadu Board Class 9 Mathematics) on one page, grouped by topic. Includes The formula is, The probability of any event E.

44 questions28 flashcards5 formulas & key relations5 concepts

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A diagram illustrating a random experiment (e.g., rolling a fair six-sided die) showing all possible outcomes and how they form the sample space. Each outcome is distinct.
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5 Entries · 3 Sections

Formulas and Key Relations

Classical Approach to Probability

The formula is

P(E) = Number of favourable outcomes / Total number of outcomes = n(E) / n(S).

The probability of any event E always satisfies

0 ≤ P(E) ≤ 1.

Empirical (Experimental) Approach to Probability

Formula

P(E) = r/n, where r = number of times event E occurred, n = total number of trials.

Types of Events

Sure (Certain) Event

An event that will definitely happen. P(E) = 1. Example: Getting a number between 1 and 6 when rolling a dice.

Impossible Event

An event that can never happen. P(E) = 0. Example: Getting 7 on a standard dice.

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Frequently Asked Questions

What are the important topics in Probability for Tamil Nadu Board Class 9 Mathematics?
Key topics in Probability include Basic Concepts and Terminology, Classical Approach to Probability, Empirical (Experimental) Approach to Probability, Types of Events. Study these first, then practise questions on each for Class 9 exams.
How many formulas are in Probability?
This sheet lists 5 formulas from Probability, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Probability for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on Probability. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Probability

All Tamil Nadu Board Class 9 Mathematics Formula Sheet

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