(4) तत्वों वाले समुच्चय से (5) तत्वों वाले समुच्चय में कितने फलन ऐसे होंगे जो एकैकी नहीं हैं?
How many functions from a (4)-element set to a (5)-element set are not one-one?
Explanation opens after your attempt
B. (505)
Concept
There are \(5^4\) total functions and \(^{5}P_4\) one-one functions. Subtract one-one functions to get not one-one functions.
Why this answer is correct
The correct answer is B. (505). There are \(5^4\) total functions and \(^{5}P_4\) one-one functions. Subtract one-one functions to get not one-one functions.
Exam Tip
कुल फलन \(5^4\) हैं और एकैकी फलन \(^{5}P_4\) हैं। जो एकैकी नहीं हैं, उन्हें घटाकर पाएँ।
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