本题目来源于试卷: Sequences & Series，类别为 IB数学
[问答题]
Given a sequence of integers, belc r,j.4; 1mvk6zrtp rzwgo/ f2x( hh6p.(zx+y/i:i fc(sepay00 qsp tween 20 and 300 , which are divisible by 9 .
1. Find their sum.
2. Express this sum using sigma notation.
An arithmetic sequence has first term -500 and common difference of 8 . The sum of the first n terms of this sequence is negative.
3. Find the greatest value of n .
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