(n) objects में से (r) objects चुनने में exactly (s) special objects लेने का सूत्र क्या है?
What is the formula for choosing (r) objects from (n) objects with exactly (s) special objects?
Explanation opens after your attempt
A. \(^{a}C_s\cdot{}^{n-a}C_{r-s}\) जहां special objects (a) हैं\(^{a}C_s\cdot{}^{n-a}C_{r-s}\) where there are (a) special objects
Simple Explanation
Special group से (s) और non-special group से (r-s) objects चुनते हैं। परीक्षा में exactly condition को product of choices में तोड़ें। / Choose (s) objects from the special group and (r-s) from the non-special group. In exams split exactly conditions into product of choices.
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