अनुक्रम \(4,7,12,19,28,\ldots\) में \(a_n=n^2+3\) है। कौन सा पद (84) है?
In the sequence \(4,7,12,19,28,\ldots\), \(a_n=n^2+3\). Which term is (84)?
Explanation opens after your attempt
B. (9)वाँ(9)th
Concept
From \(n^2+3=84\), \(n^2=81\) and (n=9). Exam tip: recognizing perfect squares saves time.
Why this answer is correct
The correct answer is B. (9)वाँ / (9)th. From \(n^2+3=84\), \(n^2=81\) and (n=9). Exam tip: recognizing perfect squares saves time.
Exam Tip
\(n^2+3=84\) से \(n^2=81\) और (n=9) मिलता है। वर्ग संख्या पहचानना समय बचाता है।
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