यदि खास वस्तु \(^{n}C_r\) के selection में शामिल न हो तो count क्या होगी?
If the special object is not included in the selection for \(^{n}C_r\) what is the count?
Explanation opens after your attempt
Correct Answer
A. \(^{n-1}C_r\)
Concept
After removing the special object all (r) objects are chosen from (n-1). In exams the lower index remains the same in the excluded case.
Why this answer is correct
The correct answer is A. \(^{n-1}C_r\). After removing the special object all (r) objects are chosen from (n-1). In exams the lower index remains the same in the excluded case.
Exam Tip
खास वस्तु हटाने के बाद (n-1) वस्तुओं में से पूरे (r) चुनने हैं। परीक्षा में excluded case में lower index वही रहता है।
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