यदि \(a_n=5\cdot3^{n-1}\) है, तो पहले (6) पदों का योग क्या होगा?
If \(a_n=5\cdot3^{n-1}\), what is the sum of the first (6) terms?
Explanation opens after your attempt
A. (1820)
Concept
Here (a=5) and (r=3), so (S_6=\frac{5\(3^6-1\)}{3-1}=1820). In exams, identify (a) and (r) from the general term.
Why this answer is correct
The correct answer is A. (1820). Here (a=5) and (r=3), so (S_6=\frac{5\(3^6-1\)}{3-1}=1820). In exams, identify (a) and (r) from the general term.
Exam Tip
यहाँ (a=5) और (r=3) है, इसलिए (S_6=\frac{5\(3^6-1\)}{3-1}=1820) है। परीक्षा में सामान्य पद से (a) और (r) पहचानें।
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