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If (a_n=6n+1), what is the value of (a_4+a_8)?
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Answer and explanation
Correct answer: 74
Given \(a_n=6n+1\), \(a_4=6(4)+1=25\) and \(a_8=6(8)+1=49\). Therefore, \(a_4+a_8=25+49=74\). Option 72 may result from ignoring the constant term \(+1\), which is incorrect. Exam tip: substitute the correct value of \(n\) each time you find a term.
Frequently asked questions
What is the correct answer to this question?
74
Why is this the correct answer?
Given \(a_n=6n+1\), \(a_4=6(4)+1=25\) and \(a_8=6(8)+1=49\). Therefore, \(a_4+a_8=25+49=74\). Option 72 may result from ignoring the constant term \(+1\), which is incorrect. Exam tip: substitute the correct value of \(n\) each time you find a term.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Arithmetic Progression.
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