यदि \(A=\{r,s,t,u\}\) और \(B=\{1,2,3,4\}\) हों, तो (A) से (B) में ऐसे कितने फलन हैं जिनका परिसर ठीक ({1,3,4}) हो?
If \(A=\{r,s,t,u\}\) and \(B=\{1,2,3,4\}\), how many functions from (A) to (B) have range exactly ({1,3,4})?
Explanation opens after your attempt
C. (36)
Concept
Values must be taken only from (1,3,4), and all three must appear. The count is \(3^4-3\cdot2^4+3=36\).
Why this answer is correct
The correct answer is C. (36). Values must be taken only from (1,3,4), and all three must appear. The count is \(3^4-3\cdot2^4+3=36\).
Exam Tip
मान केवल (1,3,4) से लेने हैं और तीनों आने चाहिए। संख्या \(3^4-3\cdot2^4+3=36\) है।
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