\(x_1+x_2+x_3+x_4=25\) और \(x_i\geq2\) हो, तो solutions की संख्या कौन-सी है?
If \(x_1+x_2+x_3+x_4=25\) and \(x_i\geq2\), what is the number of solutions?
Explanation opens after your attempt
B. \(^{20}C_3\)
Concept
Give (2) first to the four variables, leaving (17). In exams subtract the lower bound and apply non-negative stars and bars.
Why this answer is correct
The correct answer is B. \(^{20}C_3\). Give (2) first to the four variables, leaving (17). In exams subtract the lower bound and apply non-negative stars and bars.
Exam Tip
चार variables को पहले (2) देने पर (17) बचता है। परीक्षा में lower bound घटाकर non-negative stars and bars लगाएं।
Login to save your score, XP, coins and progress.
