Chapter 15 · Class 9 CBSE · Formula Sheet

Probability Formulas — Class 9 CBSE

Understand experimental probability through repeated experiments and frequency approach.

Key Formulas

Experimental Probability

P(E) = \dfrac{\text{Number of trials with outcome E}}{\text{Total number of trials}}

Range

0 \leq P(E) \leq 1

Complementary Events

P(E) + P(\bar{E}) = 1

Worked Examples

1Using: Probability

A die is thrown. Find P(getting an even number).

Step 1: Even outcomes: {2, 4, 6} = 3.

Step 2: Total outcomes = 6.

Step 3: P = 3/6 = 1/2.

Answer: 1/2

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More Class 9 CBSE Formulas

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Frequently Asked Questions

How many formulas are in Class 9 CBSE Probability?+
There are 3 formulas in the Probability chapter for Class 9 CBSE. Each formula is essential for solving problems in this topic.
How to remember Probability 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 Probability formulas enough for exams?+
Yes, these formulas cover the complete CBSE Class 9 syllabus for Probability. Practice applying them to different types of questions for full exam readiness.

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