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If (a_n=n^2+1), what is the value of (a_4)?
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Answer and explanation
Correct answer: 17
The general term is
a_n=n^2+1
. Substituting
n=4
gives
a_4=4^2+1=16+1=17
. Therefore, 17 is correct. Option 16 is only the value of
4^2
and misses the added 1. Exam tip: Substitute the term number carefully for
n
in the general rule.
Frequently asked questions
What is the correct answer to this question?
17
Why is this the correct answer?
The general term is
a_n=n^2+1
. Substituting
n=4
gives
a_4=4^2+1=16+1=17
. Therefore, 17 is correct. Option 16 is only the value of
4^2
and misses the added 1. Exam tip: Substitute the term number carefully for
n
in the general rule.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Explicit or general rule.
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