If (a_n=7n-5), which term will be (121)?
Answer and explanation
Correct answer: 18th term
To find which term equals 121, equate the general term to 121: \(7n-5=121\). Thus, \(7n=126\), so \(n=18\). Therefore, 121 is the 18th term of the sequence. The 17th term is \(114\), so it is not correct. Exam tip: To find the position of a given value, set \(a_n\) equal to that value.
Frequently asked questions
What is the correct answer to this question?
18th term
Why is this the correct answer?
To find which term equals 121, equate the general term to 121: \(7n-5=121\). Thus, \(7n=126\), so \(n=18\). Therefore, 121 is the 18th term of the sequence. The 17th term is \(114\), so it is not correct. Exam tip: To find the position of a given value, set \(a_n\) equal to that value.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Arithmetic Progression.
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