गुणोत्तर श्रेणी में \(a_2=20\) और \(a_5=2500\) है, तो \(a_1\) क्या है?

In a geometric progression, \(a_2=20\) and \(a_5=2500\). What is \(a_1\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (4)

Step 1

Concept

From \(\frac{2500}{20}=125=r^3\), (r=5) and \(a_1=20\div5=4\). In exams, find (r) first and then \(a_1\).

Step 2

Why this answer is correct

The correct answer is B. (4). From \(\frac{2500}{20}=125=r^3\), (r=5) and \(a_1=20\div5=4\). In exams, find (r) first and then \(a_1\).

Step 3

Exam Tip

\(\frac{2500}{20}=125=r^3\) से (r=5) और \(a_1=20\div5=4\) है। परीक्षा में पहले (r) निकालें फिर \(a_1\)।

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गुणोत्तर श्रेणी में \(a_2=20\) और \(a_5=2500\) है, तो \(a_1\) क्या है? / In a geometric progression, \(a_2=20\) and \(a_5=2500\). What is \(a_1\)?

Correct Answer: B. (4). Explanation: \(\frac{2500}{20}=125=r^3\) से (r=5) और \(a_1=20\div5=4\) है। परीक्षा में पहले (r) निकालें फिर \(a_1\)। / From \(\frac{2500}{20}=125=r^3\), (r=5) and \(a_1=20\div5=4\). In exams, find (r) first and then \(a_1\).

Which concept should I revise for this Mathematics MCQ?

From \(\frac{2500}{20}=125=r^3\), (r=5) and \(a_1=20\div5=4\). In exams, find (r) first and then \(a_1\).

What exam hint can help solve this Mathematics question?

\(\frac{2500}{20}=125=r^3\) से (r=5) और \(a_1=20\div5=4\) है। परीक्षा में पहले (r) निकालें फिर \(a_1\)।