यदि \(a_2=10\) और \(a_6=160\) है, तथा अनुपात धनात्मक है, तो \(a_1\) क्या होगा?

If \(a_2=10\) and \(a_6=160\), and the ratio is positive, what will be \(a_1\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

D. (5)

Step 1

Concept

\(a_6=a_2r^4\), so \(160=10r^4\) and (r=2), hence \(a_1=5\). Divide by the ratio to move backward.

Step 2

Why this answer is correct

The correct answer is D. (5). \(a_6=a_2r^4\), so \(160=10r^4\) and (r=2), hence \(a_1=5\). Divide by the ratio to move backward.

Step 3

Exam Tip

\(a_6=a_2r^4\), इसलिए \(160=10r^4\) और (r=2), अतः \(a_1=5\)। पीछे जाने के लिए अनुपात से भाग दें।

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Mathematics Answer, Explanation and Revision Hints

यदि \(a_2=10\) और \(a_6=160\) है, तथा अनुपात धनात्मक है, तो \(a_1\) क्या होगा? / If \(a_2=10\) and \(a_6=160\), and the ratio is positive, what will be \(a_1\)?

Correct Answer: D. (5). Explanation: \(a_6=a_2r^4\), इसलिए \(160=10r^4\) और (r=2), अतः \(a_1=5\)। पीछे जाने के लिए अनुपात से भाग दें। / \(a_6=a_2r^4\), so \(160=10r^4\) and (r=2), hence \(a_1=5\). Divide by the ratio to move backward.

Which concept should I revise for this Mathematics MCQ?

\(a_6=a_2r^4\), so \(160=10r^4\) and (r=2), hence \(a_1=5\). Divide by the ratio to move backward.

What exam hint can help solve this Mathematics question?

\(a_6=a_2r^4\), इसलिए \(160=10r^4\) और (r=2), अतः \(a_1=5\)। पीछे जाने के लिए अनुपात से भाग दें।