Plus One Maths Notes Chapter 7 Permutation and Combinations is part of Plus One Maths Notes. Here we have given Kerala Plus One Maths Notes Chapter 7 Permutation and Combinations.

Board | SCERT, Kerala |

Text Book | NCERT Based |

Class | Plus One |

Subject | Maths Notes |

Chapter | Chapter 7 |

Chapter Name | Permutation and Combinations |

Category | Plus One Kerala |

## Kerala Plus One Maths Notes Chapter 7 Permutation and Combinations

1. Fundamental principle of counting: If an event can occur in m different ways, following which another event can occur in n different ways, then the total number of different ways of occurrence of the events in the given order in mn.

2. The number of permutations of n different things taken r at a time, when repetition is not allowed is denoted by ^{n}Pr.

3. The number of permutations of n different things, taken r at a time where repetition is allowed is n^{r}.

4. The number of permutations of n objects where n_{1}, are of same kind is n!/n_{1}!

5. The number of permutations of n objects, where «, are of same kind, n_{2} are of same kind, …. n_{k} are of same kind is

6. A combination is a selection of some or all of a number of different objects, (order of selection is not important)

7. The number of selection of n objects taken r at a time is ^{n}Cr

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