यदि \(A=\{a,b,c,d\}\) और \(B=\{1,2,3\}\) हों तो (A) से (B) में ऐसे कितने फलन हैं जिनका परिसर ठीक ({1,2}) हो?
If \(A=\{a,b,c,d\}\) and \(B=\{1,2,3\}\), how many functions from (A) to (B) have range exactly ({1,2})?
Explanation opens after your attempt
Correct Answer
B. (14)
Concept
Values must come only from (1) and (2), and both must appear. Hence the count is \(2^4-2=14\).
Why this answer is correct
The correct answer is B. (14). Values must come only from (1) and (2), and both must appear. Hence the count is \(2^4-2=14\).
Exam Tip
मान केवल (1) और (2) से आने चाहिए और दोनों आने चाहिए। इसलिए संख्या \(2^4-2=14\) है।
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