यदि \(a_3=45\) और \(a_7=3645\) है, तथा (r) धनात्मक है, तो (r) क्या है?

If \(a_3=45\) and \(a_7=3645\), and (r) is positive, what is (r)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (3)

Step 1

Concept

\(a_7=a_3r^4\), so \(3645=45r^4\) and \(r^4=81\), hence (r=3). A four-position gap uses \(r^4\).

Step 2

Why this answer is correct

The correct answer is B. (3). \(a_7=a_3r^4\), so \(3645=45r^4\) and \(r^4=81\), hence (r=3). A four-position gap uses \(r^4\).

Step 3

Exam Tip

\(a_7=a_3r^4\), इसलिए \(3645=45r^4\) और \(r^4=81\), अतः (r=3)। चार पदों की दूरी पर \(r^4\) लगता है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_3=45\) और \(a_7=3645\) है, तथा (r) धनात्मक है, तो (r) क्या है? / If \(a_3=45\) and \(a_7=3645\), and (r) is positive, what is (r)?

Correct Answer: B. (3). Explanation: \(a_7=a_3r^4\), इसलिए \(3645=45r^4\) और \(r^4=81\), अतः (r=3)। चार पदों की दूरी पर \(r^4\) लगता है। / \(a_7=a_3r^4\), so \(3645=45r^4\) and \(r^4=81\), hence (r=3). A four-position gap uses \(r^4\).

Which concept should I revise for this Mathematics MCQ?

\(a_7=a_3r^4\), so \(3645=45r^4\) and \(r^4=81\), hence (r=3). A four-position gap uses \(r^4\).

What exam hint can help solve this Mathematics question?

\(a_7=a_3r^4\), इसलिए \(3645=45r^4\) और \(r^4=81\), अतः (r=3)। चार पदों की दूरी पर \(r^4\) लगता है।