(n) distinct objects को (3) non-empty unlabelled groups में बांटने की संख्या किससे जुड़ती है?
The number of ways to divide (n) distinct objects into (3) non-empty unlabelled groups is connected with which form?
Correct answer and explanation
A. \(\frac{1}{3!}\left(3^n-3\cdot2^n+3\right)\)
Simple Explanation
पहले (3) labelled non-empty groups गिनते हैं, फिर labels की (3!) अदला-बदली हटाते हैं। परीक्षा में unlabelled groups के लिए labelled count divide करें। / First count (3) labelled non-empty groups, then remove the (3!) label permutations. In exams divide the labelled count for unlabelled groups.
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