समांतर श्रेणी \(9,13,17,21,\ldots\) का सामान्य पद कौन-सा है?
Which is the general term of the arithmetic progression \(9,13,17,21,\ldots\)?
Explanation opens after your attempt
B. \(a_n=4n+5\)
Concept
The first term is (9) and the difference is (4), so \(a_n=4n+5\). In exams, use (a_n=a+(n-1)d).
Why this answer is correct
The correct answer is B. \(a_n=4n+5\). The first term is (9) and the difference is (4), so \(a_n=4n+5\). In exams, use (a_n=a+(n-1)d).
Exam Tip
पहला पद (9) और अंतर (4) है, इसलिए \(a_n=4n+5\) है। परीक्षा में (a_n=a+(n-1)d) लगाएँ।
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