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
Correct Answer

C. (36)

Step 1

Concept

Values must be taken only from (1,3,4), and all three must appear. The count is \(3^4-3\cdot2^4+3=36\).

Step 2

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 \(3^4-3\cdot2^4+3=36\).

Step 3

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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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})?

Correct Answer: C. (36). Explanation: मान केवल (1,3,4) से लेने हैं और तीनों आने चाहिए। संख्या \(3^4-3\cdot2^4+3=36\) है। / Values must be taken only from (1,3,4), and all three must appear. The count is \(3^4-3\cdot2^4+3=36\).

Which concept should I revise for this Mathematics MCQ?

Values must be taken only from (1,3,4), and all three must appear. The count is \(3^4-3\cdot2^4+3=36\).

What exam hint can help solve this Mathematics question?

मान केवल (1,3,4) से लेने हैं और तीनों आने चाहिए। संख्या \(3^4-3\cdot2^4+3=36\) है।