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If (a_n=12-5n), what is (a_3+a_8)?
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Answer and explanation
Correct answer: -31
Given \(a_n=12-5n\), \(a_3=12-5(3)=-3\) and \(a_8=12-5(8)=-28\). Therefore, \(a_3+a_8=-3+(-28)=-31\). The value \(-29\) can result from an error while substituting the term number or handling the negative sign. Exam tip: find each required term separately before adding them.
Frequently asked questions
What is the correct answer to this question?
-31
Why is this the correct answer?
Given \(a_n=12-5n\), \(a_3=12-5(3)=-3\) and \(a_8=12-5(8)=-28\). Therefore, \(a_3+a_8=-3+(-28)=-31\). The value \(-29\) can result from an error while substituting the term number or handling the negative sign. Exam tip: find each required term separately before adding them.
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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