अनुक्रम \(2,6,12,20,\ldots\) में (a_n=n(n+1)) है। कौन सा पद (210) है?
In the sequence \(2,6,12,20,\ldots\), (a_n=n(n+1)). Which term is (210)?
Explanation opens after your attempt
A. (14)वाँ(14)th
Concept
Since \(14\times15=210\), it is the (14)th term. Exam tip: look for products of consecutive numbers.
Why this answer is correct
The correct answer is A. (14)वाँ / (14)th. Since \(14\times15=210\), it is the (14)th term. Exam tip: look for products of consecutive numbers.
Exam Tip
\(14\times15=210\) इसलिए यह (14)वाँ पद है। लगातार संख्याओं के गुणनफल को ध्यान से देखें।
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