यदि \(A=\{1,2,3,4\}\) और \(B=\{a,b\}\) हों तो (A) से (B) में ऐसे कितने फलन हैं जिनमें (f(1)=a) या (f(2)=b) हो?
If \(A=\{1,2,3,4\}\) and \(B=\{a,b\}\), how many functions from (A) to (B) satisfy (f(1)=a) or (f(2)=b)?
Explanation opens after your attempt
C. (12)
Concept
There are \(2^4=16\) total functions, and the opposite case (f(1)=b) and (f(2)=a) gives \(2^2=4\) functions. Hence (16-4=12).
Why this answer is correct
The correct answer is C. (12). There are \(2^4=16\) total functions, and the opposite case (f(1)=b) and (f(2)=a) gives \(2^2=4\) functions. Hence (16-4=12).
Exam Tip
कुल \(2^4=16\) फलन हैं और विपरीत स्थिति (f(1)=b) तथा (f(2)=a) में \(2^2=4\) फलन हैं। इसलिए (16-4=12) है।
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