अनुक्रम \(2,4,7,11,\ldots\) का सामान्य पद क्या है?
What is the general term of the sequence \(2,4,7,11,\ldots\)?
Explanation opens after your attempt
Correct Answer
C. (a_n=\frac{n(n+1)}{2}+1)
Concept
Adding (1) to triangular numbers gives (2,4,7,11). In exams, think of triangular numbers when differences are (2,3,4).
Why this answer is correct
The correct answer is C. (a_n=\frac{n(n+1)}{2}+1). Adding (1) to triangular numbers gives (2,4,7,11). In exams, think of triangular numbers when differences are (2,3,4).
Exam Tip
त्रिभुज संख्या में (1) जोड़ने से (2,4,7,11) मिलते हैं। परीक्षा में अंतर (2,3,4) दिखे तो त्रिभुज संख्या सोचें।
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