यदि समानांतर श्रेढ़ी में \(a_4=19\) और \(a_7=31\) है, तो \(a_1\) क्या होगा?

If an arithmetic progression has \(a_4=19\) and \(a_7=31\), what is \(a_1\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (7)

Step 1

Concept

The increase over three gaps is (12), so (d=4), then (a_1=19-3(4)=7). From middle terms first find the common difference.

Step 2

Why this answer is correct

The correct answer is B. (7). The increase over three gaps is (12), so (d=4), then (a_1=19-3(4)=7). From middle terms first find the common difference.

Step 3

Exam Tip

तीन अंतरों में वृद्धि (12) है इसलिए (d=4), फिर (a_1=19-3(4)=7)। बीच के पदों से पहले समान अंतर निकालें।

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Mathematics Answer, Explanation and Revision Hints

यदि समानांतर श्रेढ़ी में \(a_4=19\) और \(a_7=31\) है, तो \(a_1\) क्या होगा? / If an arithmetic progression has \(a_4=19\) and \(a_7=31\), what is \(a_1\)?

Correct Answer: B. (7). Explanation: तीन अंतरों में वृद्धि (12) है इसलिए (d=4), फिर (a_1=19-3(4)=7)। बीच के पदों से पहले समान अंतर निकालें। / The increase over three gaps is (12), so (d=4), then (a_1=19-3(4)=7). From middle terms first find the common difference.

Which concept should I revise for this Mathematics MCQ?

The increase over three gaps is (12), so (d=4), then (a_1=19-3(4)=7). From middle terms first find the common difference.

What exam hint can help solve this Mathematics question?

तीन अंतरों में वृद्धि (12) है इसलिए (d=4), फिर (a_1=19-3(4)=7)। बीच के पदों से पहले समान अंतर निकालें।