यदि किसी समान्तर श्रेणी का (S_n=5n(2n-1)) है तो (12)वाँ पद क्या होगा?
If (S_n=5n(2n-1)) for an arithmetic progression, what is the (12)th term?
Explanation opens after your attempt
C. (225)
Concept
\(a_{12}=S_{12}-S_{11}=1380-1155=225\). Exam tip: subtract consecutive sums for a particular term.
Why this answer is correct
The correct answer is C. (225). \(a_{12}=S_{12}-S_{11}=1380-1155=225\). Exam tip: subtract consecutive sums for a particular term.
Exam Tip
\(a_{12}=S_{12}-S_{11}=1380-1155=225\) है। परीक्षा में किसी खास पद के लिए लगातार योग घटाएं।
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