Math Problem Statement
详细列出latex 表达式“$\sum_{i=0}^{N-1}\sum_{j=i}^{N-1}(j -i+1)$”中数学表达式的计算过程
Solution
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Math Problem Analysis
Mathematical Concepts
Double summation
Summation formulas
Formulas
Summation formulas for double summation
Theorems
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Suitable Grade Level
Advanced undergraduate level