यदि \(a_1=5\) और (r=-2) है, तो पहले चार पद कौन-से हैं?
If \(a_1=5\) and (r=-2), what are the first four terms?
Explanation opens after your attempt
B. (5,-10,20,-40)
Concept
Multiplying by (-2) each time gives (5,-10,20,-40). A negative ratio makes the signs alternate.
Why this answer is correct
The correct answer is B. (5,-10,20,-40). Multiplying by (-2) each time gives (5,-10,20,-40). A negative ratio makes the signs alternate.
Exam Tip
हर बार (-2) से गुणा करने पर (5,-10,20,-40) मिलते हैं। ऋणात्मक अनुपात से चिह्न बदलते हैं।
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