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
Correct Answer

B. (270)

Step 1

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.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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 \(50,45,40,\ldots\)?

Correct Answer: B. (270). Explanation: नौवाँ पद (10) है, इसलिए (S_9=\frac{9}{2}(50+10)=270)। ऋणात्मक अंतर के कारण अंतिम पद कम होगा। / 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.

Which concept should I revise for this Mathematics MCQ?

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.

What exam hint can help solve this Mathematics question?

नौवाँ पद (10) है, इसलिए (S_9=\frac{9}{2}(50+10)=270)। ऋणात्मक अंतर के कारण अंतिम पद कम होगा।