यदि \(a_2=40\) और \(a_5=320\) है, तथा अनुपात धनात्मक है, तो (r) क्या है?

If \(a_2=40\) and \(a_5=320\), and the ratio is positive, what is (r)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. (2)

Step 1

Concept

\(a_5=a_2r^3\), so \(320=40r^3\) and \(r^3=8\), hence (r=2). The gap between positions decides the exponent.

Step 2

Why this answer is correct

The correct answer is A. (2). \(a_5=a_2r^3\), so \(320=40r^3\) and \(r^3=8\), hence (r=2). The gap between positions decides the exponent.

Step 3

Exam Tip

\(a_5=a_2r^3\), इसलिए \(320=40r^3\) और \(r^3=8\), अतः (r=2)। पदों की दूरी घात तय करती है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_2=40\) और \(a_5=320\) है, तथा अनुपात धनात्मक है, तो (r) क्या है? / If \(a_2=40\) and \(a_5=320\), and the ratio is positive, what is (r)?

Correct Answer: A. (2). Explanation: \(a_5=a_2r^3\), इसलिए \(320=40r^3\) और \(r^3=8\), अतः (r=2)। पदों की दूरी घात तय करती है। / \(a_5=a_2r^3\), so \(320=40r^3\) and \(r^3=8\), hence (r=2). The gap between positions decides the exponent.

Which concept should I revise for this Mathematics MCQ?

\(a_5=a_2r^3\), so \(320=40r^3\) and \(r^3=8\), hence (r=2). The gap between positions decides the exponent.

What exam hint can help solve this Mathematics question?

\(a_5=a_2r^3\), इसलिए \(320=40r^3\) और \(r^3=8\), अतः (r=2)। पदों की दूरी घात तय करती है।