अनुक्रम \(3,5,8,12,\ldots\) का सामान्य पद क्या है?
What is the general term of the sequence \(3,5,8,12,\ldots\)?
Explanation opens after your attempt
B. (a_n=\frac{n(n+1)}{2}+2)
Concept
(\frac{n(n+1)}{2}+2) gives (3,5,8,12). In exams think of triangular numbers when differences are (2,3,4).
Why this answer is correct
The correct answer is B. (a_n=\frac{n(n+1)}{2}+2). (\frac{n(n+1)}{2}+2) gives (3,5,8,12). In exams think of triangular numbers when differences are (2,3,4).
Exam Tip
(\frac{n(n+1)}{2}+2) से (3,5,8,12) मिलते हैं। परीक्षा में बढ़ते अंतर (2,3,4) देखकर त्रिभुज संख्या सोचें।
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