本题目来源于试卷: Sequences & Series，类别为 IB数学
[问答题]
Given a sequence of integers, between 2)uvy (yy4uw3ghqw t 280 and knhbz./c-.1 ycc: mwl300 , 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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