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If (a_n=30-n), what is the tenth term?
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Answer and explanation
Correct answer: \(20\)
For the tenth term, substitute \(n=10\): \(a_{10}=30-10=20\). Therefore, the correct answer is \(20\). The value \(21\) would result from incorrectly using \(n=9\). Exam tip: first substitute the given term number carefully into the formula for the \(n\)th term.
Frequently asked questions
What is the correct answer to this question?
\(20\)
Why is this the correct answer?
For the tenth term, substitute \(n=10\): \(a_{10}=30-10=20\). Therefore, the correct answer is \(20\). The value \(21\) would result from incorrectly using \(n=9\). Exam tip: first substitute the given term number carefully into the formula for the \(n\)th term.
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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