समांतर श्रेणी \(12,9,6,3,\ldots\) का सामान्य पद क्या है?
What is the general term of the arithmetic progression \(12,9,6,3,\ldots\)?
Explanation opens after your attempt
B. \(a_n=15-3n\)
Concept
At (n=1) it gives (12), and at (n=2) it gives (9), so \(a_n=15-3n\). In exams, choose the rule after checking the first term.
Why this answer is correct
The correct answer is B. \(a_n=15-3n\). At (n=1) it gives (12), and at (n=2) it gives (9), so \(a_n=15-3n\). In exams, choose the rule after checking the first term.
Exam Tip
(n=1) पर (12) और (n=2) पर (9) मिलता है, इसलिए \(a_n=15-3n\) है। परीक्षा में पहला पद जाँचकर नियम चुनें।
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