\(x_1+x_2+x_3+x_4=30\) में \(x_1\geq2\), \(x_2\geq3\), \(x_3\geq4\), \(x_4\geq5\) हो, तो count क्या है?
In \(x_1+x_2+x_3+x_4=30\), if \(x_1\geq2\), \(x_2\geq3\), \(x_3\geq4\), \(x_4\geq5\), what is the count?
Explanation opens after your attempt
A. \(^{19}C_3\)
Concept
After removing the minimum sum (14), (16) remains, so \({}^{16+4-1}C_{3}\) is obtained. In exams subtract unequal lower bounds first.
Why this answer is correct
The correct answer is A. \(^{19}C_3\). After removing the minimum sum (14), (16) remains, so \({}^{16+4-1}C_{3}\) is obtained. In exams subtract unequal lower bounds first.
Exam Tip
Minimum sum (14) हटाने पर (16) बचता है, इसलिए \({}^{16+4-1}C_{3}\) मिलता है। परीक्षा में unequal lower bounds पहले subtract करें।
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