(10) people की line में (A) (B) से पहले और (C) (D) से पहले आए। Count क्या होगा?
In a line of (10) people, (A) must come before (B) and (C) before (D). What is the count?
Explanation opens after your attempt
Correct Answer
B. \(\frac{10!}{4}\)
Concept
Each of the two independent relative-order restrictions halves the count. In exams divide by \(2^k\) for independent before-after pairs.
Why this answer is correct
The correct answer is B. \(\frac{10!}{4}\). Each of the two independent relative-order restrictions halves the count. In exams divide by \(2^k\) for independent before-after pairs.
Exam Tip
दो स्वतंत्र relative order restrictions में हर एक count को आधा करता है। परीक्षा में independent before-after pairs पर \(2^k\) से divide करें।
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