\({}^{12}C_4+{}^{12}C_5+{}^{13}C_6\) को simplify करने में कौन-सा पहला सही step है?
What is the first correct step in simplifying \({}^{12}C_4+{}^{12}C_5+{}^{13}C_6\)?
Explanation opens after your attempt
Correct Answer
A. \({}^{12}C_4+{}^{12}C_5={}^{13}C_5\)
Concept
By Pascal identity, the same upper index with adjacent lower indices combines. In exams first combine the adjacent pair.
Why this answer is correct
The correct answer is A. \({}^{12}C_4+{}^{12}C_5={}^{13}C_5\). By Pascal identity, the same upper index with adjacent lower indices combines. In exams first combine the adjacent pair.
Exam Tip
Pascal identity से same upper index और adjacent lower indices combine होते हैं। परीक्षा में पहले adjacent pair को combine करें।
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