Math Problem Statement
Cho dãy số ( u n ) với u n = 2 + 5 1 − n . Kết luận nào sau đây là đúng A . Dãy số không đơn điệu B . Dãy số giảm và không bị chặn C . Dãy số tăng D . Dãy số giảm và bị chặn
Solution
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Math Problem Analysis
Mathematical Concepts
Sequences
Monotonicity
Boundedness
Formulas
u_n = 2 + \frac{5}{1-n}
Difference of consecutive terms: u_{n+1} - u_n
Theorems
Monotonicity test for sequences
Boundedness of sequences
Suitable Grade Level
Grades 10-12
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