नियम \(a_n=n^2+3n\) से \(a_5\) क्या होगा?
What will \(a_5\) be for the rule \(a_n=n^2+3n\)?
Explanation opens after your attempt
B. (40)
Concept
Putting (n=5), (a_5=52+3(5)=40). Handle both the square and multiplication carefully.
Why this answer is correct
The correct answer is B. (40). Putting (n=5), (a_5=52+3(5)=40). Handle both the square and multiplication carefully.
Exam Tip
(n=5) रखने पर (a_5=52+3(5)=40) है। वर्ग और गुणा दोनों सावधानी से करें।
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