If (a_n=15-2n), what is the value of (a_5)?
Answer and explanation
Correct answer: 5
Given \(a_n=15-2n\), substitute \(n=5\): \(a_5=15-2(5)=15-10=5\). Therefore, 5 is correct. The value 7 would result from incorrectly subtracting \(n\) instead of \(2n\). Exam tip: To find a specified term from a general rule, substitute the given value of \(n\) carefully.
Frequently asked questions
What is the correct answer to this question?
5
Why is this the correct answer?
Given \(a_n=15-2n\), substitute \(n=5\): \(a_5=15-2(5)=15-10=5\). Therefore, 5 is correct. The value 7 would result from incorrectly subtracting \(n\) instead of \(2n\). Exam tip: To find a specified term from a general rule, substitute the given value of \(n\) carefully.
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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