यदि किसी समांतर श्रेणी में \(S_9=225\) और \(S_{18}=855\) है, तो दसवें से अठारहवें पदों का योग कितना है?
If an arithmetic progression has \(S_9=225\) and \(S_{18}=855\), what is the sum of the (10)th to (18)th terms?
Explanation opens after your attempt
C. (630)
Concept
The sum of the (10)th to (18)th terms is \(S_{18}-S_9=630\). For a group of consecutive terms, take the difference of partial sums.
Why this answer is correct
The correct answer is C. (630). The sum of the (10)th to (18)th terms is \(S_{18}-S_9=630\). For a group of consecutive terms, take the difference of partial sums.
Exam Tip
दसवें से अठारहवें पदों का योग \(S_{18}-S_9=630\) है। लगातार पदों के समूह के लिए आंशिक योगों का अंतर लें।
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