यदि (8) objects को (4) और (4) के दो unlabelled groups में बाँटना हो तो expression क्या होगा?
If (8) objects are divided into two unlabelled groups of (4) and (4), what is the expression?
Explanation opens after your attempt
A. \(\frac{^{8}C_4}{2!}\)
Concept
After choosing the first (4)-group the second is fixed, and interchanging the two groups creates duplicate count. In exams divide by (2!) for equal groups.
Why this answer is correct
The correct answer is A. \(\frac{^{8}C_4}{2!}\). After choosing the first (4)-group the second is fixed, and interchanging the two groups creates duplicate count. In exams divide by (2!) for equal groups.
Exam Tip
पहला (4)-group चुनने पर दूसरा तय है और दोनों groups interchange होने से duplicate count आता है। परीक्षा में equal groups हों तो (2!) से भाग दें।
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