समांतर श्रेढ़ी \(50,45,40,\ldots\) के पहले (9) पदों का योग कितना है?
What is the sum of the first (9) terms of the arithmetic progression \(50,45,40,\ldots\)?
Explanation opens after your attempt
B. (270)
Concept
The ninth term is (10), so (S_9=\frac{9}{2}(50+10)=270). Because the difference is negative, the last term will be smaller.
Why this answer is correct
The correct answer is B. (270). The ninth term is (10), so (S_9=\frac{9}{2}(50+10)=270). Because the difference is negative, the last term will be smaller.
Exam Tip
नौवाँ पद (10) है, इसलिए (S_9=\frac{9}{2}(50+10)=270)। ऋणात्मक अंतर के कारण अंतिम पद कम होगा।
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