यदि \(a_n=7\cdot2^{n-1}\) है तो पहले (6) पदों का योग क्या होगा?
If \(a_n=7\cdot2^{n-1}\), what is the sum of the first (6) terms?
Explanation opens after your attempt
C. (441)
Concept
Here (a=7) and (r=2), so (S_6=7\(2^6-1\)=441). In exams identify (a) and (r) from the general term.
Why this answer is correct
The correct answer is C. (441). Here (a=7) and (r=2), so (S_6=7\(2^6-1\)=441). In exams identify (a) and (r) from the general term.
Exam Tip
यहाँ (a=7) और (r=2) है इसलिए (S_6=7\(2^6-1\)=441) है। परीक्षा में सामान्य पद से (a) और (r) पहचानें।
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