यदि किसी गुणोत्तर श्रेढ़ी में \(a_2=12\) और \(a_5=324\) है, तथा अनुपात धनात्मक है, तो (r) क्या होगा?

If a geometric progression has \(a_2=12\) and \(a_5=324\), and the ratio is positive, what is (r)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (3)

Step 1

Concept

\(a_5=a_2r^3\), so \(324=12r^3\) and \(r^3=27\), hence (r=3). The gap between positions decides the exponent.

Step 2

Why this answer is correct

The correct answer is B. (3). \(a_5=a_2r^3\), so \(324=12r^3\) and \(r^3=27\), hence (r=3). The gap between positions decides the exponent.

Step 3

Exam Tip

\(a_5=a_2r^3\), इसलिए \(324=12r^3\) और \(r^3=27\), अतः (r=3)। पदों की दूरी घात तय करती है।

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यदि किसी गुणोत्तर श्रेढ़ी में \(a_2=12\) और \(a_5=324\) है, तथा अनुपात धनात्मक है, तो (r) क्या होगा? / If a geometric progression has \(a_2=12\) and \(a_5=324\), and the ratio is positive, what is (r)?

Correct Answer: B. (3). Explanation: \(a_5=a_2r^3\), इसलिए \(324=12r^3\) और \(r^3=27\), अतः (r=3)। पदों की दूरी घात तय करती है। / \(a_5=a_2r^3\), so \(324=12r^3\) and \(r^3=27\), hence (r=3). The gap between positions decides the exponent.

Which concept should I revise for this Mathematics MCQ?

\(a_5=a_2r^3\), so \(324=12r^3\) and \(r^3=27\), hence (r=3). The gap between positions decides the exponent.

What exam hint can help solve this Mathematics question?

\(a_5=a_2r^3\), इसलिए \(324=12r^3\) और \(r^3=27\), अतः (r=3)। पदों की दूरी घात तय करती है।