If \(a_n=\frac{n+1}{2}\), what is the value of \(a_5\)?
Answer and explanation
Correct answer: 3
Given \(a_n=\frac{n+1}{2}\). To find \(a_5\), substitute \(n=5\): \(a_5=\frac{5+1}{2}=\frac{6}{2}=3\). Therefore, 3 is the correct option. Choosing 2 may result from incorrectly adding \(n+1\). Exam tip: substitute the term number carefully into the general-term formula.
Frequently asked questions
What is the correct answer to this question?
3
Why is this the correct answer?
Given \(a_n=\frac{n+1}{2}\). To find \(a_5\), substitute \(n=5\): \(a_5=\frac{5+1}{2}=\frac{6}{2}=3\). Therefore, 3 is the correct option. Choosing 2 may result from incorrectly adding \(n+1\). Exam tip: substitute the term number carefully into the general-term formula.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Explicit or general rule.
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