समांतर श्रेणी में \(a_7=34\) और \(a_{12}=69\) है। \(a_1\) क्या है?

In an arithmetic progression, \(a_7=34\) and \(a_{12}=69\). What is \(a_1\)?

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

A. (-8)

Step 1

Concept

\(a_{12}-a_7=5d=35\), so (d=7) and (a_1=34-6(7)=-8). First find (d), then move backward.

Step 2

Why this answer is correct

The correct answer is A. (-8). \(a_{12}-a_7=5d=35\), so (d=7) and (a_1=34-6(7)=-8). First find (d), then move backward.

Step 3

Exam Tip

\(a_{12}-a_7=5d=35\), इसलिए (d=7) और (a_1=34-6(7)=-8)। पहले (d) निकालकर पीछे जाएं।

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Mathematics Answer, Explanation and Revision Hints

समांतर श्रेणी में \(a_7=34\) और \(a_{12}=69\) है। \(a_1\) क्या है? / In an arithmetic progression, \(a_7=34\) and \(a_{12}=69\). What is \(a_1\)?

Correct Answer: A. (-8). Explanation: \(a_{12}-a_7=5d=35\), इसलिए (d=7) और (a_1=34-6(7)=-8)। पहले (d) निकालकर पीछे जाएं। / \(a_{12}-a_7=5d=35\), so (d=7) and (a_1=34-6(7)=-8). First find (d), then move backward.

Which concept should I revise for this Mathematics MCQ?

\(a_{12}-a_7=5d=35\), so (d=7) and (a_1=34-6(7)=-8). First find (d), then move backward.

What exam hint can help solve this Mathematics question?

\(a_{12}-a_7=5d=35\), इसलिए (d=7) और (a_1=34-6(7)=-8)। पहले (d) निकालकर पीछे जाएं।