गुणोत्तर श्रेणी में \(a_2=18\) और \(a_5=486\) है तो \(a_1\) क्या है?

In a geometric progression \(a_2=18\) and \(a_5=486\). What is \(a_1\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (6)

Step 1

Concept

From \(\frac{486}{18}=27=r^3\), (r=3) and \(a_1=18\div3=6\). In exams find (r) first and then \(a_1\).

Step 2

Why this answer is correct

The correct answer is C. (6). From \(\frac{486}{18}=27=r^3\), (r=3) and \(a_1=18\div3=6\). In exams find (r) first and then \(a_1\).

Step 3

Exam Tip

\(\frac{486}{18}=27=r^3\) से (r=3) और \(a_1=18\div3=6\) है। परीक्षा में पहले (r) निकालें फिर \(a_1\)।

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गुणोत्तर श्रेणी में \(a_2=18\) और \(a_5=486\) है तो \(a_1\) क्या है? / In a geometric progression \(a_2=18\) and \(a_5=486\). What is \(a_1\)?

Correct Answer: C. (6). Explanation: \(\frac{486}{18}=27=r^3\) से (r=3) और \(a_1=18\div3=6\) है। परीक्षा में पहले (r) निकालें फिर \(a_1\)। / From \(\frac{486}{18}=27=r^3\), (r=3) and \(a_1=18\div3=6\). In exams find (r) first and then \(a_1\).

Which concept should I revise for this Mathematics MCQ?

From \(\frac{486}{18}=27=r^3\), (r=3) and \(a_1=18\div3=6\). In exams find (r) first and then \(a_1\).

What exam hint can help solve this Mathematics question?

\(\frac{486}{18}=27=r^3\) से (r=3) और \(a_1=18\div3=6\) है। परीक्षा में पहले (r) निकालें फिर \(a_1\)।