What is the sum of all integers from 60 to 90 inclusive?

The sum of inclusive integers is the Average of inclusive numbers × Count of Inclusive Numbers

Pushing the Average and Count button above, we get the following math:

A = | A + B |

2 |

A = | 60 + 90 |

2 |

A = | 150 |

2 |

A =

Count = B - A + 1

90 - 60 + 1

Count =

Therefore, the sum of inclusive integers from 60 to 90 = 75 x 31 =