यदि \(a_n=3n^3-n\) है तो \(a_3\) का मान क्या होगा?
If \(a_n=3n^3-n\) then what is the value of \(a_3\)?
Explanation opens after your attempt
B. (78)
Concept
\(a_3=3\times27-3=78\). In exams subtract the current (n) after cubing.
Why this answer is correct
The correct answer is B. (78). \(a_3=3\times27-3=78\). In exams subtract the current (n) after cubing.
Exam Tip
\(a_3=3\times27-3=78\) है। परीक्षा में घन के बाद वर्तमान (n) घटाएँ।
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