((a+b)^n) में \(a^{n-r}b^r\) का coefficient \(^{n}C_r\) क्यों होता है?
Why is the coefficient of \(a^{n-r}b^r\) in ((a+b)^n) equal to \(^{n}C_r\)?
Explanation opens after your attempt
A. क्योंकि (r) brackets से (b) चुनते हैंBecause (b) is chosen from (r) brackets
Concept
To form \(b^r\), choose (r) brackets from (n) brackets. In exams connect binomial coefficients with bracket selection.
Why this answer is correct
The correct answer is A. क्योंकि (r) brackets से (b) चुनते हैं / Because (b) is chosen from (r) brackets. To form \(b^r\), choose (r) brackets from (n) brackets. In exams connect binomial coefficients with bracket selection.
Exam Tip
\(b^r\) बनाने के लिए (n) brackets में से (r) brackets चुनते हैं। परीक्षा में binomial coefficient को bracket selection से जोड़ें।
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