If (a_n=7n-5), what will be the ninth term?
Answer and explanation
Correct answer: 58
To find the ninth term, substitute \(n=9\) in the formula: \(a_9=7\times 9-5=63-5=58\). Therefore, 58 is correct. A value such as 56 can result from an error in multiplication or subtraction. Exam tip: first substitute the given value of \(n\), then calculate according to the order of operations.
Frequently asked questions
What is the correct answer to this question?
58
Why is this the correct answer?
To find the ninth term, substitute \(n=9\) in the formula: \(a_9=7\times 9-5=63-5=58\). Therefore, 58 is correct. A value such as 56 can result from an error in multiplication or subtraction. Exam tip: first substitute the given value of \(n\), then calculate according to the order of 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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