Math Problem Statement
Uma progressão harmônica é uma sequência de números cujos os inversos formam uma PA. Seja S_n a soma dos n primeiros termos da progressão harmônica 3,4,6, ... Então: \begin{tasks}(3) \task $S_4=20$ \task $S_4=25$ \task $S_5=49$ \task $S_6=49$ \task $S_2=\dfrac{1}{3}S_4$ \end{tasks}
Solution
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Math Problem Analysis
Mathematical Concepts
Harmonic Progression
Arithmetic Progression
Summation
Formulas
Harmonic progression: The nth term of a harmonic progression is the inverse of an arithmetic progression term.
Arithmetic progression general term: a_n = a_1 + (n-1)r
Summation of first n terms of an arithmetic progression: S_n = n/2 (2a_1 + (n-1)r)
Theorems
Relationship between harmonic and arithmetic progressions
Suitable Grade Level
Grades 10-12
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