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If (a_n=2n-1), what is the eighth term?
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Answer and explanation
Correct answer: \(15\)
For the eighth term, substitute \(n=8\): \(a_8=2(8)-1=16-1=15\). Therefore, the correct answer is \(15\). \(16\) would result if the \(-1\) in the formula were omitted. Exam tip: in an \(n\)th-term question, substitute the given value of \(n\) carefully into the formula.
Frequently asked questions
What is the correct answer to this question?
\(15\)
Why is this the correct answer?
For the eighth term, substitute \(n=8\): \(a_8=2(8)-1=16-1=15\). Therefore, the correct answer is \(15\). \(16\) would result if the \(-1\) in the formula were omitted. Exam tip: in an \(n\)th-term question, substitute the given value of \(n\) carefully into the formula.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: nth term.
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