समांतर श्रेणी \(25,20,15,10,\ldots\) का सामान्य पद कौन-सा है?
Which is the general term of the arithmetic progression \(25,20,15,10,\ldots\)?
Explanation opens after your attempt
B. \(a_n=30-5n\)
Concept
At (n=1) it gives (25), and at (n=2) it gives (20), so \(a_n=30-5n\). In exams, check a decreasing rule with the first term.
Why this answer is correct
The correct answer is B. \(a_n=30-5n\). At (n=1) it gives (25), and at (n=2) it gives (20), so \(a_n=30-5n\). In exams, check a decreasing rule with the first term.
Exam Tip
(n=1) पर (25) और (n=2) पर (20) मिलता है, इसलिए \(a_n=30-5n\) है। परीक्षा में घटते नियम को पहले पद से जाँचें।
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