यदि (n) अलग वस्तुओं को (r) और (n-r) के दो unlabelled groups में बाँटना हो तो formula कौन-सा है?
If (n) distinct objects are divided into two unlabelled groups of sizes (r) and (n-r), what is the formula?
Explanation opens after your attempt
B. \(^{n}C_r\)
Concept
Once one group is chosen, the other group is fixed, so \(^{n}C_r\) is enough. In exams count only one selection when the complement is fixed.
Why this answer is correct
The correct answer is B. \(^{n}C_r\). Once one group is chosen, the other group is fixed, so \(^{n}C_r\) is enough. In exams count only one selection when the complement is fixed.
Exam Tip
एक group चुनते ही दूसरा group तय हो जाता है इसलिए \(^{n}C_r\) पर्याप्त है। परीक्षा में complement fixed हो तो एक ही selection गिनें।
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