If (a_n=30-2n), what is the value of (a_7)?
Answer and explanation
Correct answer: 16
Given \(a_n=30-2n\), substitute \(n=7\) to find the seventh term: \(a_7=30-2(7)=30-14=16\). Therefore, 16 is correct. The value 14 would result from using an incorrect term number or calculation. Exam tip: substitute the required term number carefully for \(n\) in the general term.
Frequently asked questions
What is the correct answer to this question?
16
Why is this the correct answer?
Given \(a_n=30-2n\), substitute \(n=7\) to find the seventh term: \(a_7=30-2(7)=30-14=16\). Therefore, 16 is correct. The value 14 would result from using an incorrect term number or calculation. Exam tip: substitute the required term number carefully for \(n\) in the general term.
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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