यदि \(a_5=486\) और (r=3) है तो \(a_1\) का मान क्या है?

If \(a_5=486\) and (r=3), what is the value of \(a_1\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (6)

Step 1

Concept

\(a_5=a\cdot3^4\), so \(a=486\div81=6\). In exams divide the fifth term by \(r^4\).

Step 2

Why this answer is correct

The correct answer is C. (6). \(a_5=a\cdot3^4\), so \(a=486\div81=6\). In exams divide the fifth term by \(r^4\).

Step 3

Exam Tip

\(a_5=a\cdot3^4\) इसलिए \(a=486\div81=6\) है। परीक्षा में पाँचवें पद से \(r^4\) भाग दें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_5=486\) और (r=3) है तो \(a_1\) का मान क्या है? / If \(a_5=486\) and (r=3), what is the value of \(a_1\)?

Correct Answer: C. (6). Explanation: \(a_5=a\cdot3^4\) इसलिए \(a=486\div81=6\) है। परीक्षा में पाँचवें पद से \(r^4\) भाग दें। / \(a_5=a\cdot3^4\), so \(a=486\div81=6\). In exams divide the fifth term by \(r^4\).

Which concept should I revise for this Mathematics MCQ?

\(a_5=a\cdot3^4\), so \(a=486\div81=6\). In exams divide the fifth term by \(r^4\).

What exam hint can help solve this Mathematics question?

\(a_5=a\cdot3^4\) इसलिए \(a=486\div81=6\) है। परीक्षा में पाँचवें पद से \(r^4\) भाग दें।