अनुक्रम \(2,12,30,56,90,\ldots\) का (n)वाँ पद (a_n=n(n+1)(?)) जैसा नहीं है। सही \(a_n\) कौन सा है?
The sequence \(2,12,30,56,90,\ldots\) does not simply fit (a_n=n(n+1)(?)). Which \(a_n\) is correct?
Explanation opens after your attempt
Correct Answer
B. \(a_n=n^3+n\)
Concept
This question has inconsistent options because \(n^3+n\) gives (10) at (n=2), not (12). Exam tip: verify every option before accepting a pattern.
Why this answer is correct
The correct answer is B. \(a_n=n^3+n\). This question has inconsistent options because \(n^3+n\) gives (10) at (n=2), not (12). Exam tip: verify every option before accepting a pattern.
Exam Tip
\(n^3+n\) से (2,10) नहीं बल्कि (n=2) पर (10) आता है इसलिए यह गलत है। सही मिलान \(a_n=2n^2+?\) जैसा चाहिए था।
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