\(x_1+x_2+x_3+x_4+x_5=12\) में exactly (3) variables positive हों, तो count क्या होगा?
In \(x_1+x_2+x_3+x_4+x_5=12\), if exactly (3) variables are positive, what is the count?
Explanation opens after your attempt
A. \(^{5}C_3{}^{11}C_2\)
Concept
Choose the (3) positive variables first, then split (12) into (3) positive parts. In exams use choose variables plus positive stars and bars for exactly positive variables.
Why this answer is correct
The correct answer is A. \(^{5}C_3{}^{11}C_2\). Choose the (3) positive variables first, then split (12) into (3) positive parts. In exams use choose variables plus positive stars and bars for exactly positive variables.
Exam Tip
पहले (3) positive variables चुनें, फिर (12) को (3) positive parts में बांटें। परीक्षा में exactly positive variables में choose variables plus positive stars-bars करें।
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