The (n)th term of an AP is (a_n=2n+3). What will be the (18)th term?
Answer and explanation
Correct answer: 39
Given \(a_n=2n+3\), substitute \(n=18\) to find the 18th term: \(a_{18}=2(18)+3=36+3=39\). Therefore, 39 is correct. The option 41 can result from an arithmetic error while multiplying or adding. Exam tip: substitute the term number carefully into the formula before simplifying.
Frequently asked questions
What is the correct answer to this question?
39
Why is this the correct answer?
Given \(a_n=2n+3\), substitute \(n=18\) to find the 18th term: \(a_{18}=2(18)+3=36+3=39\). Therefore, 39 is correct. The option 41 can result from an arithmetic error while multiplying or adding. Exam tip: substitute the term number carefully into the formula before simplifying.
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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