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The general term of an AP is (a_n=7n+2). Find the (11)th term.
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Answer and explanation
Correct answer: 79
Given \(a_n=7n+2\), substitute \(n=11\) to get \(a_{11}=7\times11+2=77+2=79\). Therefore, 79 is correct. The close distractor 77 results from forgetting to add \(+2\). In exams, substitute the term number carefully for \(n\).
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What is the correct answer to this question?
79
Why is this the correct answer?
Given \(a_n=7n+2\), substitute \(n=11\) to get \(a_{11}=7\times11+2=77+2=79\). Therefore, 79 is correct. The close distractor 77 results from forgetting to add \(+2\). In exams, substitute the term number carefully for \(n\).
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Arithmetic Progressions (AP). Topic: Finding the $n$th term of an AP.
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