गुणोत्तर श्रेढ़ी \(a,ar,ar^2,\ldots\) में \(a_1=9\) और \(a_4=72\) है। धनात्मक (r) क्या होगा?

In the geometric progression \(a,ar,ar^2,\ldots\), \(a_1=9\) and \(a_4=72\). What will be the positive (r)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. (2)

Step 1

Concept

\(a_4=a_1r^3\), so \(72=9r^3\) and \(r^3=8\), hence (r=2). Use the position gap as the exponent.

Step 2

Why this answer is correct

The correct answer is A. (2). \(a_4=a_1r^3\), so \(72=9r^3\) and \(r^3=8\), hence (r=2). Use the position gap as the exponent.

Step 3

Exam Tip

\(a_4=a_1r^3\), इसलिए \(72=9r^3\) और \(r^3=8\), अतः (r=2)। पदों की दूरी को घात बनाएं।

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गुणोत्तर श्रेढ़ी \(a,ar,ar^2,\ldots\) में \(a_1=9\) और \(a_4=72\) है। धनात्मक (r) क्या होगा? / In the geometric progression \(a,ar,ar^2,\ldots\), \(a_1=9\) and \(a_4=72\). What will be the positive (r)?

Correct Answer: A. (2). Explanation: \(a_4=a_1r^3\), इसलिए \(72=9r^3\) और \(r^3=8\), अतः (r=2)। पदों की दूरी को घात बनाएं। / \(a_4=a_1r^3\), so \(72=9r^3\) and \(r^3=8\), hence (r=2). Use the position gap as the exponent.

Which concept should I revise for this Mathematics MCQ?

\(a_4=a_1r^3\), so \(72=9r^3\) and \(r^3=8\), hence (r=2). Use the position gap as the exponent.

What exam hint can help solve this Mathematics question?

\(a_4=a_1r^3\), इसलिए \(72=9r^3\) और \(r^3=8\), अतः (r=2)। पदों की दूरी को घात बनाएं।