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 \(a_7\)?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

C. (31)

Step 1

Concept

\(a_7=\frac{7\times8}{2}+3=31\). In exams add (3) to the triangular number.

Step 2

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.

Step 3

Exam Tip

\(a_7=\frac{7\times8}{2}+3=31\) है। परीक्षा में त्रिभुज संख्या में (3) जोड़ें।

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Mathematics Answer, Explanation and Revision Hints

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 \(a_7\)?

Correct Answer: C. (31). Explanation: \(a_7=\frac{7\times8}{2}+3=31\) है। परीक्षा में त्रिभुज संख्या में (3) जोड़ें। / \(a_7=\frac{7\times8}{2}+3=31\). In exams add (3) to the triangular number.

Which concept should I revise for this Mathematics MCQ?

\(a_7=\frac{7\times8}{2}+3=31\). In exams add (3) to the triangular number.

What exam hint can help solve this Mathematics question?

\(a_7=\frac{7\times8}{2}+3=31\) है। परीक्षा में त्रिभुज संख्या में (3) जोड़ें।