题目
Problem
An arithmetic progression has first term 5 and common difference 6.
For this progression, find the sum of all the terms that lie between 150 and 400.
[6]
题目中文翻译
一个等差数列的首项为 5，公差为 6。
对于该数列，求所有介于 150 和 400 之间的项的和。
[6]
An arithmetic progression has first term 5 and common difference 6.
For this progression, find the sum of all the terms that lie between 150 and 400.
一个等差数列的首项为 5，公差为 6。
对于该数列，求所有介于 150 和 400 之间的项的和。