**1. Experiment: **An operation which can produce some well-defined outcomes is called an experiment.

**2.Random Experiment: **An experiment in which all possible outcomes are known and the exact output cannot be predicted in advance, is called a random experiment.

**Examples of Performing a Random Experiment:**

- Rolling an unbiased dice.
- Tossing a fair coin.
- Drawing a card from a pack of well-shamed curds.
- Picking up a ball of a certain color from a bag containing balls of different

colors.

**Details:**

- When we throw a coin. Then either a Head (H) or a Tail (T) appears.
- Dice is a solid cube, having 6 faces, marked 1,2,3,4,5,6 respectively when we throw a die, the outcome is the number that appears on its upper face.
- A pack of cards has 52 cards.
- It has 13 cards of each suit, namely Spades, Clubs, Hearts and Diamonds.
- Cards of spades and clubs are black cards.
- Cards of hearts and diamonds are red cards.
- There are 4 honors of each suit.
- These are Aces, Kings, Queens and Jacks.
- These are called face cards.

**Sample Space**: When we perform an experiment, then the set S of all possible outcomes is called the Sample Space.**Examples of Sample Spaces**:- In tossing a coin, S={H, T}
- if two coins are tossed then S= {HH,HT,TH,TT},
- In rolling a dice, we have, S={1, 2, 3, 4, 5, 6},