समांतर श्रेणी \(9,7,5,3,\ldots\) का सामान्य पद क्या है?
What is the general term of the arithmetic progression \(9,7,5,3,\ldots\)?
Explanation opens after your attempt
B. \(a_n=11-2n\)
Concept
At (n=1) it gives (9), and at (n=2) it gives (7), so \(a_n=11-2n\). In exams, choose the rule after checking the first term.
Why this answer is correct
The correct answer is B. \(a_n=11-2n\). At (n=1) it gives (9), and at (n=2) it gives (7), so \(a_n=11-2n\). In exams, choose the rule after checking the first term.
Exam Tip
(n=1) पर (9) और (n=2) पर (7) मिलता है, इसलिए \(a_n=11-2n\) है। परीक्षा में पहला पद जाँचकर नियम चुनें।
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