यदि किसी गुणोत्तर श्रेढ़ी में \(a_2=10\) और (r=2) है, तो \(a_1\) क्या होगा?
If a geometric progression has \(a_2=10\) and (r=2), what is \(a_1\)?
Explanation opens after your attempt
B. (5)
Concept
\(a_2=a_1r\), so \(10=a_1\cdot2\) and \(a_1=5\). Divide by the ratio to move backward.
Why this answer is correct
The correct answer is B. (5). \(a_2=a_1r\), so \(10=a_1\cdot2\) and \(a_1=5\). Divide by the ratio to move backward.
Exam Tip
\(a_2=a_1r\), इसलिए \(10=a_1\cdot2\) और \(a_1=5\)। पीछे जाने के लिए अनुपात से भाग दें।
Login to save your score, XP, coins and progress.
