\({}^{n}C_r{}^{r}C_s{}^{s}C_t\) को सही क्रम बदलकर किस रूप में लिखा जा सकता है?
By changing the order of selection, \({}^{n}C_r{}^{r}C_s{}^{s}C_t\) can be correctly written as which form?
Explanation opens after your attempt
Correct Answer
A. \(^{n}C_t{}^{n-t}C_{s-t}{}^{n-s}C_{r-s}\)
Concept
First choose the innermost (t) members, then add (s-t), then (r-s) members. In exams count nested choices backward by layers.
Why this answer is correct
The correct answer is A. \(^{n}C_t{}^{n-t}C_{s-t}{}^{n-s}C_{r-s}\). First choose the innermost (t) members, then add (s-t), then (r-s) members. In exams count nested choices backward by layers.
Exam Tip
पहले सबसे अंदर के (t) members चुनें, फिर (s-t), फिर (r-s) members जोड़ें। परीक्षा में nested choices को layers में उल्टा गिनें।
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