(5) पत्रों को (5) सही लिफाफों में इस प्रकार डालने के तरीके कितने हैं कि कोई पत्र सही लिफाफे में न जाए?
How many ways are there to put (5) letters into (5) addressed envelopes so that no letter goes into the correct envelope?
Explanation opens after your attempt
B. (44)
Concept
This is the derangement of (5) objects, whose value is (44). In derangement, no object remains in its correct place.
Why this answer is correct
The correct answer is B. (44). This is the derangement of (5) objects, whose value is (44). In derangement, no object remains in its correct place.
Exam Tip
यह (5) वस्तुओं का पूर्ण विस्थापन है, जिसका मान (44) होता है। विस्थापन में कोई वस्तु अपनी सही जगह पर नहीं रहती।
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