समांतर श्रेणी \(36,30,24,18,\ldots\) का सामान्य पद कौन-सा है?
Which is the general term of the arithmetic progression \(36,30,24,18,\ldots\)?
Explanation opens after your attempt
B. \(a_n=42-6n\)
Concept
At (n=1) it gives (36), and at (n=2) it gives (30), so \(a_n=42-6n\). In exams, check a decreasing rule with the first term.
Why this answer is correct
The correct answer is B. \(a_n=42-6n\). At (n=1) it gives (36), and at (n=2) it gives (30), so \(a_n=42-6n\). In exams, check a decreasing rule with the first term.
Exam Tip
(n=1) पर (36) और (n=2) पर (30) मिलता है, इसलिए \(a_n=42-6n\) है। परीक्षा में घटते नियम को पहले पद से जाँचें।
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