If (a_n=18+n), what is the value of (a_5)?
Answer and explanation
Correct answer: 23
The general term is \(a_n=18+n\). Substituting \(n=5\), we get \(a_5=18+5=23\), so option C is correct. The value \(22\) would be obtained for \(n=4\), making it a close but incorrect distractor. Exam tip: To find a particular term, replace \(n\) in the general rule with that term number.
Frequently asked questions
What is the correct answer to this question?
23
Why is this the correct answer?
The general term is \(a_n=18+n\). Substituting \(n=5\), we get \(a_5=18+5=23\), so option C is correct. The value \(22\) would be obtained for \(n=4\), making it a close but incorrect distractor. Exam tip: To find a particular term, replace \(n\) in the general rule with that term number.
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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