(n) distinct objects को (r) labelled boxes में exactly (r-1) non-empty boxes में भेजने की count कौन-सी है?
What is the count for sending (n) distinct objects into (r) labelled boxes with exactly (r-1) non-empty boxes?
Explanation opens after your attempt
A. (^{r}C_1\left((r-1)^n-{}^{r-1}C_1(r-2)^n+\cdots\right))
Simple Explanation
पहले empty box चुनें और बाकी (r-1) boxes में onto distribution करें। परीक्षा में exactly non-empty boxes में choose empty plus onto count करें। / Choose the empty box first and then distribute onto the remaining (r-1) boxes. In exams use choose empty plus onto count for exactly non-empty boxes.
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