पास्कल identity में \(^{8}C_4\) को किन दो भागों में तोड़ा जाएगा?
In Pascal's identity into which two parts will \(^{8}C_4\) be split?
Explanation opens after your attempt
A. \(^{7}C_4+^{7}C_3\)
Concept
Put (n=8) and (r=4) in \(^{n}C_r=^{n-1}C_r+^{n-1}C_{r-1}\). In exams the upper index of both terms decreases by (1).
Why this answer is correct
The correct answer is A. \(^{7}C_4+^{7}C_3\). Put (n=8) and (r=4) in \(^{n}C_r=^{n-1}C_r+^{n-1}C_{r-1}\). In exams the upper index of both terms decreases by (1).
Exam Tip
\(^{n}C_r=^{n-1}C_r+^{n-1}C_{r-1}\) में (n=8) और (r=4) रखें। परीक्षा में दोनों terms का upper index (1) कम होता है।
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