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If (a_n=2^n+1), what is the fourth term?
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Answer and explanation
Correct answer: 17
To find the fourth term, substitute \(n=4\): \(a_4=2^4+1=16+1=17\). Therefore, the correct answer is 17. The close distractor 16 results from forgetting to add 1 after evaluating \(2^4\). Exam tip: evaluate the exponent first, then perform the remaining operations.
Frequently asked questions
What is the correct answer to this question?
17
Why is this the correct answer?
To find the fourth term, substitute \(n=4\): \(a_4=2^4+1=16+1=17\). Therefore, the correct answer is 17. The close distractor 16 results from forgetting to add 1 after evaluating \(2^4\). Exam tip: evaluate the exponent first, then perform the remaining operations.
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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