यदि गुणोत्तर श्रेढ़ी में \(a_2=28\) और (r=4) है, तो \(a_1\) क्या होगा?

If a geometric progression has \(a_2=28\) and (r=4), what is \(a_1\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (7)

Step 1

Concept

\(a_2=a_1r\), so \(28=a_1\cdot4\) and \(a_1=7\). Divide by the ratio to move backward.

Step 2

Why this answer is correct

The correct answer is B. (7). \(a_2=a_1r\), so \(28=a_1\cdot4\) and \(a_1=7\). Divide by the ratio to move backward.

Step 3

Exam Tip

\(a_2=a_1r\), इसलिए \(28=a_1\cdot4\) और \(a_1=7\)। पीछे जाने के लिए अनुपात से भाग दें।

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Mathematics Answer, Explanation and Revision Hints

यदि गुणोत्तर श्रेढ़ी में \(a_2=28\) और (r=4) है, तो \(a_1\) क्या होगा? / If a geometric progression has \(a_2=28\) and (r=4), what is \(a_1\)?

Correct Answer: B. (7). Explanation: \(a_2=a_1r\), इसलिए \(28=a_1\cdot4\) और \(a_1=7\)। पीछे जाने के लिए अनुपात से भाग दें। / \(a_2=a_1r\), so \(28=a_1\cdot4\) and \(a_1=7\). Divide by the ratio to move backward.

Which concept should I revise for this Mathematics MCQ?

\(a_2=a_1r\), so \(28=a_1\cdot4\) and \(a_1=7\). Divide by the ratio to move backward.

What exam hint can help solve this Mathematics question?

\(a_2=a_1r\), इसलिए \(28=a_1\cdot4\) और \(a_1=7\)। पीछे जाने के लिए अनुपात से भाग दें।