यदि \(A=\{u,v,w,x,y\}\) और \(B=\{1,2,3,4\}\) हों, तो (A) से (B) में ऐसे कितने फलन हैं जिनका परिसर ठीक ({2,4}) हो?
If \(A=\{u,v,w,x,y\}\) and \(B=\{1,2,3,4\}\), how many functions from (A) to (B) have range exactly ({2,4})?
Explanation opens after your attempt
Correct Answer
B. (30)
Concept
Values must be taken only from (2) and (4), and both values must occur. Hence the number is \(2^5-2=30\).
Why this answer is correct
The correct answer is B. (30). Values must be taken only from (2) and (4), and both values must occur. Hence the number is \(2^5-2=30\).
Exam Tip
मान केवल (2) और (4) से लेने हैं और दोनों मान आने चाहिए। इसलिए संख्या \(2^5-2=30\) है।
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