Plus One Maths Notes Chapter 16 Probability is part of Plus One Maths Notes. Here we have given Kerala Plus One Maths Notes Chapter 16 Probability.

Board | SCERT, Kerala |

Text Book | NCERT Based |

Class | Plus One |

Subject | Maths Notes |

Chapter | Chapter 16 |

Chapter Name | Probability |

Category | Plus One Kerala |

## Kerala Plus One Maths Notes Chapter 16 Probability

**Random Experiments:**An experiment is called random experiment, if it satisfies the following two conditions:- It has more than one possible outcome.
- It is not possible to predict the outcome in advance.

**Outcome:**A possible result of a random experiment is called its outcome.**Sample Space:**The set of all possible out-comes in a random experiment is called a sample space.**Trial:**When an experiment is repeated undersimilar conditions and it does not give same result each time but may result in anyone of the several possible outcomes, the experiment is called a trial.**Event :**Every subset of a sample space is called an event.**Mutually Exclusive Event:**A and B are mutually exclusive if A ∩ B = φ**Algebra of Events**: We can combine two or more events by using the operators of sets union (∪), intersection (∩), difference (-), complement (’).**Equally likely outcomes:**All outcomes with equal probability.**Probability of an event:**For a finite sample space with equally likely outcomes.

Probability of an event

, where n(A) = number of elements in the set A,

n(S) = number of elements in the set S.

If A and B are mutually exclusive, then P(A or B) = P(A) + P (B) – P(A and B)

equivalently,

P(A ∪ B) = P(A) + P(B) – P(A∩B)

If A and B are mutually exclusive, then P(A or B) = P(A) + P(B)

If A is any event, then P(not A) = 1 – P(A)

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