(n) identical balls को (r) distinct boxes में हर box non-empty हो तो formula कैसे बदलता है?
How does the formula change if (n) identical balls are distributed into (r) distinct boxes with every box non-empty?
Explanation opens after your attempt
Correct Answer
A. \({}^{n-1}C_{r-1}\)
Concept
Give (1) ball to each box first, then distribute the remaining (n-r) balls. In exams allot the minimum first for non-empty conditions.
Why this answer is correct
The correct answer is A. \({}^{n-1}C_{r-1}\). Give (1) ball to each box first, then distribute the remaining (n-r) balls. In exams allot the minimum first for non-empty conditions.
Exam Tip
हर box को पहले (1) ball दें, फिर बाकी (n-r) balls distribute करें। परीक्षा में non-empty condition में पहले minimum allot करें।
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