यदि \(a_1=10\) और \(a_4=270\) है तथा (r) धनात्मक है, तो \(a_5\) क्या होगा?

If \(a_1=10\) and \(a_4=270\), and (r) is positive, what is \(a_5\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

B. (810)

Step 1

Concept

From \(270=10r^3\), \(r^3=27\) and (r=3), so \(a_5=270\cdot3=810\). In exams, find the ratio first.

Step 2

Why this answer is correct

The correct answer is B. (810). From \(270=10r^3\), \(r^3=27\) and (r=3), so \(a_5=270\cdot3=810\). In exams, find the ratio first.

Step 3

Exam Tip

\(270=10r^3\) से \(r^3=27\) और (r=3), इसलिए \(a_5=270\cdot3=810\) है। परीक्षा में पहले अनुपात निकालें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_1=10\) और \(a_4=270\) है तथा (r) धनात्मक है, तो \(a_5\) क्या होगा? / If \(a_1=10\) and \(a_4=270\), and (r) is positive, what is \(a_5\)?

Correct Answer: B. (810). Explanation: \(270=10r^3\) से \(r^3=27\) और (r=3), इसलिए \(a_5=270\cdot3=810\) है। परीक्षा में पहले अनुपात निकालें। / From \(270=10r^3\), \(r^3=27\) and (r=3), so \(a_5=270\cdot3=810\). In exams, find the ratio first.

Which concept should I revise for this Mathematics MCQ?

From \(270=10r^3\), \(r^3=27\) and (r=3), so \(a_5=270\cdot3=810\). In exams, find the ratio first.

What exam hint can help solve this Mathematics question?

\(270=10r^3\) से \(r^3=27\) और (r=3), इसलिए \(a_5=270\cdot3=810\) है। परीक्षा में पहले अनुपात निकालें।