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If (a_n=20-2n), what is the fourth term?
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Answer and explanation
Correct answer: 12
To find the fourth term, substitute n=4: \(a_4=20-2(4)=20-8=12\). Therefore, the correct answer is 12. The value 14 is obtained for n=3, so it is the third term. Exam tip: carefully substitute the required term number for n in the nth-term formula.
Frequently asked questions
What is the correct answer to this question?
12
Why is this the correct answer?
To find the fourth term, substitute n=4: \(a_4=20-2(4)=20-8=12\). Therefore, the correct answer is 12. The value 14 is obtained for n=3, so it is the third term. Exam tip: carefully substitute the required term number for n in the nth-term formula.
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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