If (a_n=25-6n), when will (a_n=1)?
Answer and explanation
Correct answer: 4th term
Given \(a_n=25-6n\) and \(a_n=1\), set \(25-6n=1\). This gives \(6n=24\), so \(n=4\). Therefore, the 4th term is 1. The 3rd term is \(25-18=7\), so it is not correct. Exam tip: To find the position of a specified term, equate the nth-term expression to that value and solve for \(n\).
Frequently asked questions
What is the correct answer to this question?
4th term
Why is this the correct answer?
Given \(a_n=25-6n\) and \(a_n=1\), set \(25-6n=1\). This gives \(6n=24\), so \(n=4\). Therefore, the 4th term is 1. The 3rd term is \(25-18=7\), so it is not correct. Exam tip: To find the position of a specified term, equate the nth-term expression to that value and solve for \(n\).
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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