अनुक्रम \(0,2,6,12,20,\ldots\) में (a_n=n(n-1)) है। \(a_{15}\) क्या है?
In the sequence \(0,2,6,12,20,\ldots\), (a_n=n(n-1)). What is \(a_{15}\)?
Explanation opens after your attempt
D. (210)
Concept
\(a_{15}=15\times14=210\). Exam tip: substitute the term number for (n) in the formula.
Why this answer is correct
The correct answer is D. (210). \(a_{15}=15\times14=210\). Exam tip: substitute the term number for (n) in the formula.
Exam Tip
\(a_{15}=15\times14=210\) है। सूत्र में (n) की जगह पद संख्या रखें।
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