यदि \(a_1=8\) और \(a_4=216\) है तथा (r) धनात्मक है, तो \(a_5\) क्या होगा?

If \(a_1=8\) and \(a_4=216\), and (r) is positive, what is \(a_5\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (648)

Step 1

Concept

From \(216=8r^3\), \(r^3=27\) and (r=3), so \(a_5=216\cdot3=648\). In exams, find the ratio first.

Step 2

Why this answer is correct

The correct answer is C. (648). From \(216=8r^3\), \(r^3=27\) and (r=3), so \(a_5=216\cdot3=648\). In exams, find the ratio first.

Step 3

Exam Tip

\(216=8r^3\) से \(r^3=27\) और (r=3), इसलिए \(a_5=216\cdot3=648\) है। परीक्षा में पहले अनुपात निकालें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=8\) और \(a_4=216\) है तथा (r) धनात्मक है, तो \(a_5\) क्या होगा? / If \(a_1=8\) and \(a_4=216\), and (r) is positive, what is \(a_5\)?

Correct Answer: C. (648). Explanation: \(216=8r^3\) से \(r^3=27\) और (r=3), इसलिए \(a_5=216\cdot3=648\) है। परीक्षा में पहले अनुपात निकालें। / From \(216=8r^3\), \(r^3=27\) and (r=3), so \(a_5=216\cdot3=648\). In exams, find the ratio first.

Which concept should I revise for this Mathematics MCQ?

From \(216=8r^3\), \(r^3=27\) and (r=3), so \(a_5=216\cdot3=648\). In exams, find the ratio first.

What exam hint can help solve this Mathematics question?

\(216=8r^3\) से \(r^3=27\) और (r=3), इसलिए \(a_5=216\cdot3=648\) है। परीक्षा में पहले अनुपात निकालें।