यदि \(a_n=9\cdot2^{n-1}\) है, तो पहले (8) पदों का योग क्या होगा?
If \(a_n=9\cdot2^{n-1}\), what is the sum of the first (8) terms?
Explanation opens after your attempt
A. (2295)
Concept
Here (a=9) and (r=2), so (S_8=9\(2^8-1\)=2295). In exams, identify (a) and (r) from the general term.
Why this answer is correct
The correct answer is A. (2295). Here (a=9) and (r=2), so (S_8=9\(2^8-1\)=2295). In exams, identify (a) and (r) from the general term.
Exam Tip
यहाँ (a=9) और (r=2) है, इसलिए (S_8=9\(2^8-1\)=2295) है। परीक्षा में सामान्य पद से (a) और (r) पहचानें।
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