यदि (a_n=\frac{n(n+1)}{2}+3) है तो \(a_7\) का मान क्या होगा?
If (a_n=\frac{n(n+1)}{2}+3) then what is the value of \(a_7\)?
Explanation opens after your attempt
C. (31)
Concept
\(a_7=\frac{7\times8}{2}+3=31\). In exams add (3) to the triangular number.
Why this answer is correct
The correct answer is C. (31). \(a_7=\frac{7\times8}{2}+3=31\). In exams add (3) to the triangular number.
Exam Tip
\(a_7=\frac{7\times8}{2}+3=31\) है। परीक्षा में त्रिभुज संख्या में (3) जोड़ें।
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