Exactly (2) fixed points वाले permutations of (7) objects की संख्या क्या है?
What is the number of permutations of (7) objects with exactly (2) fixed points?
Explanation opens after your attempt
A. \(^{7}C_2D_5\)
Concept
First choose the (2) objects that stay fixed and derange the remaining (5). In exams use choose fixed plus derange rest for exactly fixed points.
Why this answer is correct
The correct answer is A. \(^{7}C_2D_5\). First choose the (2) objects that stay fixed and derange the remaining (5). In exams use choose fixed plus derange rest for exactly fixed points.
Exam Tip
पहले सही रहने वाले (2) objects चुनें और बाकी (5) objects derange करें। परीक्षा में exactly fixed points के लिए choose fixed plus derange rest लगाएं।
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