अनुक्रम (a_n=(-1)^n n) समांतर श्रेणी है या नहीं?
Is the sequence (a_n=(-1)^n n) an AP?
Explanation opens after your attempt
C. नहीं, लगातार अंतर स्थिर नहीं हैNo, the consecutive difference is not constant
Concept
The signs alternate and the difference does not remain the same. In exams, test alternating-sign sequences by differences only.
Why this answer is correct
The correct answer is C. नहीं, लगातार अंतर स्थिर नहीं है / No, the consecutive difference is not constant. The signs alternate and the difference does not remain the same. In exams, test alternating-sign sequences by differences only.
Exam Tip
पदों के चिन्ह बदलते हैं और अंतर समान नहीं रहता। परीक्षा में वैकल्पिक चिन्ह वाले अनुक्रम को अंतर से ही परखें।
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