किसी गुणोत्तर श्रेणी में पहला पद (6) और पाँचवाँ पद (486) है। यदि (r) धनात्मक है तो (r) क्या है?

In a geometric progression the first term is (6) and the fifth term is (486). If (r) is positive what is (r)?

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

B. (3)

Step 1

Concept

From \(486=6r^4\), \(r^4=81\) and (r=3). In exams remember \(r^4\) for the fifth term.

Step 2

Why this answer is correct

The correct answer is B. (3). From \(486=6r^4\), \(r^4=81\) and (r=3). In exams remember \(r^4\) for the fifth term.

Step 3

Exam Tip

\(486=6r^4\) से \(r^4=81\) और (r=3) है। परीक्षा में पाँचवें पद के लिए \(r^4\) याद रखें।

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किसी गुणोत्तर श्रेणी में पहला पद (6) और पाँचवाँ पद (486) है। यदि (r) धनात्मक है तो (r) क्या है? / In a geometric progression the first term is (6) and the fifth term is (486). If (r) is positive what is (r)?

Correct Answer: B. (3). Explanation: \(486=6r^4\) से \(r^4=81\) और (r=3) है। परीक्षा में पाँचवें पद के लिए \(r^4\) याद रखें। / From \(486=6r^4\), \(r^4=81\) and (r=3). In exams remember \(r^4\) for the fifth term.

Which concept should I revise for this Mathematics MCQ?

From \(486=6r^4\), \(r^4=81\) and (r=3). In exams remember \(r^4\) for the fifth term.

What exam hint can help solve this Mathematics question?

\(486=6r^4\) से \(r^4=81\) और (r=3) है। परीक्षा में पाँचवें पद के लिए \(r^4\) याद रखें।