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JEE Mains · Maths · STD 12 - 1. relation and function

मान लीजिए कि \(\mathrm{A}=\{1,3,7,9,11\}\) और \(\mathrm{B}=\{2,4,5,7,8,10,12\}\). तो \(f(1)+f(3)=14\) होने वाले एकैकी फलनों \(f: A \rightarrow B\) की कुल संख्या .......... है.

  1. A \(180\)
  2. B \(120\)
  3. C \(480\)
  4. D \(240\)
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Answer & Solution

Correct Answer

(D) \(240\)

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Detailed explanation

\( A=\{1,3,7,9,11\} \) \( B=\{2,4,5,7,8,10,12\} \) \( f(1)+f(3)=14 \) \( \text { (i) } 2+12 \) \( \text { (ii) } 4+10 \) \( 2 \times(2 \times 5 \times 4 \times 3)=240\)
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