\(x_1+x_2+x_3=21\) और \(x_i\geq3\) हो, तो हलों की संख्या क्या होगी?
If \(x_1+x_2+x_3=21\) and \(x_i\geq3\), what is the number of solutions?
Explanation opens after your attempt
A. \(^{14}C_2\)
Concept
Giving (3) first to each variable leaves (12), then count non-negative solutions. In exams shift the minimum condition.
Why this answer is correct
The correct answer is A. \(^{14}C_2\). Giving (3) first to each variable leaves (12), then count non-negative solutions. In exams shift the minimum condition.
Exam Tip
हर variable को पहले (3) देने पर (12) बचता है, फिर अऋणात्मक हल गिनते हैं। परीक्षा में minimum condition को shift करें।
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