# Numbers and their divisibility

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jayvijaykale's
version from
2015-12-17 03:10

## Section

Question | Answer |
---|---|

prime no | are not evenly divisible numbers, are divisible by one or itself |

composite no | are evenly divisible numbers, are multiples of prime numbers |

coprime / relatively prime no | two numbers which have highest common factor 1 |

twin prime numbers | two prime numbers whose difference is 2 |

divisibility of 2 | last digit is even |

divisibility of 3 | sum is divisible by 3 |

divisibility of 4 | last two digits are divisible by 4 |

divisibility of 5 | last digit is 0 or 5 |

divisibility of 6 | number is divisible by both 3 and 2 |

divisibility of 7 | double and subtract the last digit from rest number, the number obtained is either 0 or divisible by 7 |

divisibility of 8 | the last three digits are divisible by 8 |

divisibility of 9 | sum is divisible by 9 |

divisibility of 10 | last digit is 0 |

divisibility of 11 | add and subtract digits alternatively, the number obtained is either zero or multiple of 11 |

divisibility of 12 | should be divisible by both 3 and 4 |

log of zero | does not exist |

log of -ve | not defined |

who is excluded from the base of logarithm | unity |

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