किस गुणोत्तर श्रेणी में \(a_2=16\) और \(a_5=1024\) है। यदि (r) धनात्मक है, तो \(a_1\) क्या है?
In a geometric progression \(a_2=16\) and \(a_5=1024\). If (r) is positive, what is \(a_1\)?
Explanation opens after your attempt
C. (4)
Concept
\(\frac{1024}{16}=64=r^3\), so (r=4) and \(a_1=\frac{16}{4}=4\). In exams, find (r) first and then the first term.
Why this answer is correct
The correct answer is C. (4). \(\frac{1024}{16}=64=r^3\), so (r=4) and \(a_1=\frac{16}{4}=4\). In exams, find (r) first and then the first term.
Exam Tip
\(\frac{1024}{16}=64=r^3\) से (r=4) और \(a_1=\frac{16}{4}=4\) है। परीक्षा में पहले (r) निकालें फिर पहला पद।
Login to save your score, XP, coins and progress.
