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If (a_n=(-1)^{n+1}(4n+1)), what is the value of (a_8)?
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Answer and explanation
Correct answer: (-33)
For (n=8), ((-1)^9=-1) and (4(8)+1=33), so (a_8=-33). In alternating signs, check whether the exponent is even or odd.
Frequently asked questions
What is the correct answer to this question?
(-33)
Why is this the correct answer?
For (n=8), ((-1)^9=-1) and (4(8)+1=33), so (a_8=-33). In alternating signs, check whether the exponent is even or odd.
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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