यदि \(a_5=18\) और \(a_{14}=81\) है, तो \(a_1\) क्या होगा?

If \(a_5=18\) and \(a_{14}=81\), what is \(a_1\)?

Author: Muft Shiksha Editorial Team Published:
Explanation opens after your attempt
Correct Answer

A. (-10)

Step 1

Concept

\(a_{14}-a_5=9d=63\), so (d=7) and (a_1=18-4(7)=-10). Find the common difference first.

Step 2

Why this answer is correct

The correct answer is A. (-10). \(a_{14}-a_5=9d=63\), so (d=7) and (a_1=18-4(7)=-10). Find the common difference first.

Step 3

Exam Tip

\(a_{14}-a_5=9d=63\), इसलिए (d=7) और (a_1=18-4(7)=-10)। पहले समान अंतर निकालें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_5=18\) और \(a_{14}=81\) है, तो \(a_1\) क्या होगा? / If \(a_5=18\) and \(a_{14}=81\), what is \(a_1\)?

Correct Answer: A. (-10). Explanation: \(a_{14}-a_5=9d=63\), इसलिए (d=7) और (a_1=18-4(7)=-10)। पहले समान अंतर निकालें। / \(a_{14}-a_5=9d=63\), so (d=7) and (a_1=18-4(7)=-10). Find the common difference first.

Which concept should I revise for this Mathematics MCQ?

\(a_{14}-a_5=9d=63\), so (d=7) and (a_1=18-4(7)=-10). Find the common difference first.

What exam hint can help solve this Mathematics question?

\(a_{14}-a_5=9d=63\), इसलिए (d=7) और (a_1=18-4(7)=-10)। पहले समान अंतर निकालें।