(n) distinct symbols से length (r) strings में exactly one repeated symbol और बाकी all distinct हों, तो count का core expression क्या होगा?
For length (r) strings from (n) distinct symbols with exactly one repeated symbol and all others distinct, what is the core expression?
Explanation opens after your attempt
A. \(n\cdot{}^{n-1}C_{r-2}\cdot\frac{r!}{2!}\)
Simple Explanation
Repeated symbol चुनें, बाकी (r-2) distinct symbols चुनें, फिर multiset arrange करें। परीक्षा में exactly one repeat में repeated item पहले fix करें। / Choose the repeated symbol, choose the remaining (r-2) distinct symbols, then arrange the multiset. In exams fix the repeated item first for exactly one repeat.
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