यदि \(a_n=81\left(\frac{1}{3}\right)^{n-1}\) है, तो \(a_2+a_5\) कितना होगा?
If \(a_n=81\left(\frac{1}{3}\right)^{n-1}\), what is \(a_2+a_5\)?
Explanation opens after your attempt
A. (28)
Concept
\(a_2=27\) and \(a_5=1\), so the sum is (28). With a fractional ratio, terms decrease quickly.
Why this answer is correct
The correct answer is A. (28). \(a_2=27\) and \(a_5=1\), so the sum is (28). With a fractional ratio, terms decrease quickly.
Exam Tip
\(a_2=27\) और \(a_5=1\), इसलिए योग (28) है। भिन्न अनुपात में हर पद तेजी से घटता है।
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