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If (a_n=17-4n), what is the value of (a_5+a_{11})?
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Answer and explanation
Correct answer: -30
Given \(a_n=17-4n\), \(a_5=17-4(5)=-3\) and \(a_{11}=17-4(11)=-27\). Therefore, \(a_5+a_{11}=-3+(-27)=-30\). A value such as \(-28\) can result from an error while adding the negative terms. Exam tip: find each required term separately and then add them with their signs.
Frequently asked questions
What is the correct answer to this question?
-30
Why is this the correct answer?
Given \(a_n=17-4n\), \(a_5=17-4(5)=-3\) and \(a_{11}=17-4(11)=-27\). Therefore, \(a_5+a_{11}=-3+(-27)=-30\). A value such as \(-28\) can result from an error while adding the negative terms. Exam tip: find each required term separately and then add them with their signs.
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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