यदि \(a_n=n^2-1\) है, तो \(a_9\) का मान क्या होगा?

If \(a_n=n^2-1\), what is the value of \(a_9\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (80)

Step 1

Concept

\(a_9=9^2-1=80\). First square and then subtract (1).

Step 2

Why this answer is correct

The correct answer is B. (80). \(a_9=9^2-1=80\). First square and then subtract (1).

Step 3

Exam Tip

\(a_9=9^2-1=80\)। पहले वर्ग करें फिर (1) घटाएं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_n=n^2-1\) है, तो \(a_9\) का मान क्या होगा? / If \(a_n=n^2-1\), what is the value of \(a_9\)?

Correct Answer: B. (80). Explanation: \(a_9=9^2-1=80\)। पहले वर्ग करें फिर (1) घटाएं। / \(a_9=9^2-1=80\). First square and then subtract (1).

Which concept should I revise for this Mathematics MCQ?

\(a_9=9^2-1=80\). First square and then subtract (1).

What exam hint can help solve this Mathematics question?

\(a_9=9^2-1=80\)। पहले वर्ग करें फिर (1) घटाएं।