यदि \(A=\{1,2,3,4,5,6,7\}\) और \(B=\{0,1\}\) हों, तो (A) से (B) में ऐसे कितने फलन हैं जिनमें ठीक (4) इनपुटों की छवि (1) हो?

If \(A=\{1,2,3,4,5,6,7\}\) and \(B=\{0,1\}\), how many functions from (A) to (B) have exactly (4) inputs with image (1)?

Explanation opens after your attempt
Correct Answer

C. (35)

Step 1

Concept

Exactly four of the seven inputs must be mapped to (1). The number is \(\binom{7}{4}=35\).

Step 2

Why this answer is correct

The correct answer is C. (35). Exactly four of the seven inputs must be mapped to (1). The number is \(\binom{7}{4}=35\).

Step 3

Exam Tip

सात इनपुटों में से ठीक चार को (1) पर भेजना है। संख्या \(\binom{7}{4}=35\) है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{1,2,3,4,5,6,7\}\) और \(B=\{0,1\}\) हों, तो (A) से (B) में ऐसे कितने फलन हैं जिनमें ठीक (4) इनपुटों की छवि (1) हो? / If \(A=\{1,2,3,4,5,6,7\}\) and \(B=\{0,1\}\), how many functions from (A) to (B) have exactly (4) inputs with image (1)?

Correct Answer: C. (35). Explanation: सात इनपुटों में से ठीक चार को (1) पर भेजना है। संख्या \(\binom{7}{4}=35\) है। / Exactly four of the seven inputs must be mapped to (1). The number is \(\binom{7}{4}=35\).

Which concept should I revise for this Mathematics MCQ?

Exactly four of the seven inputs must be mapped to (1). The number is \(\binom{7}{4}=35\).

What exam hint can help solve this Mathematics question?

सात इनपुटों में से ठीक चार को (1) पर भेजना है। संख्या \(\binom{7}{4}=35\) है।