यदि (a_n=(-1)^{n+1}n-2) है तो \(a_9+a_{10}\) का मान क्या होगा?

If (a_n=(-1)^{n+1}n-2), what will be the value of \(a_9+a_{10}\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. (-19)

Step 1

Concept

\(a_9=81\) and \(a_{10}=-100\), so the sum is (-19). Exam tip: track both power and sign.

Step 2

Why this answer is correct

The correct answer is A. (-19). \(a_9=81\) and \(a_{10}=-100\), so the sum is (-19). Exam tip: track both power and sign.

Step 3

Exam Tip

\(a_9=81\) और \(a_{10}=-100\) इसलिए योग (-19) है। घात और संकेत दोनों पर ध्यान दें।

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Mathematics Answer, Explanation and Revision Hints

यदि (a_n=(-1)^{n+1}n-2) है तो \(a_9+a_{10}\) का मान क्या होगा? / If (a_n=(-1)^{n+1}n-2), what will be the value of \(a_9+a_{10}\)?

Correct Answer: A. (-19). Explanation: \(a_9=81\) और \(a_{10}=-100\) इसलिए योग (-19) है। घात और संकेत दोनों पर ध्यान दें। / \(a_9=81\) and \(a_{10}=-100\), so the sum is (-19). Exam tip: track both power and sign.

Which concept should I revise for this Mathematics MCQ?

\(a_9=81\) and \(a_{10}=-100\), so the sum is (-19). Exam tip: track both power and sign.

What exam hint can help solve this Mathematics question?

\(a_9=81\) और \(a_{10}=-100\) इसलिए योग (-19) है। घात और संकेत दोनों पर ध्यान दें।