यदि (n) distinct objects को (a,a,b) आकार के unlabelled groups में बांटा जाए और (2a+b=n), तो extra division किससे होगा?
If (n) distinct objects are divided into unlabelled groups of sizes (a,a,b) and (2a+b=n), what is the extra division?
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C. (2!)
Simple Explanation
दो groups का size (a) समान है इसलिए उनकी अदला-बदली duplicate देती है। परीक्षा में equal-size unlabelled groups पर extra factorial divide करें। / Two groups have the same size (a), so interchanging them gives duplicates. In exams divide extra by factorial for equal-size unlabelled groups.
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