यदि \(a_n=n^2+4n\) है तो पहले तीन पदों का योग क्या होगा?
If \(a_n=n^2+4n\) then what is the sum of the first three terms?
Explanation opens after your attempt
B. (38)
Concept
The first three terms are (5,12,21) and the sum is (38). In exams write all terms before adding.
Why this answer is correct
The correct answer is B. (38). The first three terms are (5,12,21) and the sum is (38). In exams write all terms before adding.
Exam Tip
पहले तीन पद (5,12,21) हैं और योग (38) है। परीक्षा में योग से पहले सभी पद लिखें।
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