Class 10 Math: Probability Quick Revision Chapter Summary

Need to review the entire chapter before a test? This quick revision guide summarizes all the core concepts, topics, and equations taught in Class 10 Probability to help you refresh your memory instantly.

Core Topics At a Glance

### 📌 Classical definition of probability review The classical definition of probability defines the likelihood of an event E occurring as the ratio of the number of outcomes favorable to E to the total number of equally likely outcomes in the sample space.

### 📌 Complementary events The complement of an event E is the event 'not E', denoted as E'. The sum of the probability of an event and its complementary event is always exactly 1.

### 📌 Probability of cards, coins, and dice games Standard probability scenarios use playing cards (52 cards: 26 red, 26 black; 4 suits of 13 cards each), coins (1 coin: 2 outcomes; 2 coins: 4 outcomes; 3 coins: 8 outcomes), and dice (1 die: 6 outcomes; 2 dice: 36 outcomes).

### 📌 Impossible and Sure events An impossible event is an event that can never occur; its probability is 0 (e.g., rolling a 7 on a standard die). A sure (or certain) event is guaranteed to happen; its probability is 1 (e.g., rolling a number less than 7).

Key Formulas Mind Map

• Complementary Probability: `P(E) + P(\bar{E}) = 1` - Sum of probability of an event and its complement is exactly 1....

Revision Checklist

1. Review the subtopic guides and outline notes.
2. Practice writing the key formulas from memory.
3. Solve at least 3 worked examples and check your steps.
4. Take a timed practice quiz to verify your speed.