यदि (a_n=\frac{n(n+3)}{2}) है तो कौन सा पद (65) है?
If (a_n=\frac{n(n+3)}{2}), which term is (65)?
Explanation opens after your attempt
D. (10)वाँ(10)th
Concept
Since \(\frac{10\times13}{2}=65\), it is the (10)th term. Exam tip: substitute options directly into the formula.
Why this answer is correct
The correct answer is D. (10)वाँ / (10)th. Since \(\frac{10\times13}{2}=65\), it is the (10)th term. Exam tip: substitute options directly into the formula.
Exam Tip
\(\frac{10\times13}{2}=65\) इसलिए यह (10)वाँ पद है। विकल्पों को सीधे सूत्र में रखकर जाँच सकते हैं।
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