Math Problem Statement
In an arithmetic sequence, u6= -5 and U9= -20. Find S20
Solution
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Math Problem Analysis
Mathematical Concepts
Arithmetic Sequences
Summation of Sequences
Formulas
General term of an arithmetic sequence: u_n = u_1 + (n - 1)d
Sum of the first n terms: S_n = (n/2) * (u_1 + u_n)
Theorems
Arithmetic Sequence Formula
Summation of Arithmetic Sequences
Suitable Grade Level
Grades 9-10
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