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

फलनों \(f :\{1,2,3,4\} \rightarrow\{1,2,3,4,5,6\}\) जिनके लिए \(f(1)+f(2)=f(3)\), है, की कुल संख्या है :

  1. A \(60\)
  2. B \(90\)
  3. C \(108\)
  4. D \(126\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(90\)

Step-by-step Solution

Detailed explanation

\(A =\{1,2,3,4\}\) \(B =\{1,2,3,4,5,6\}\) Here \(f(3)\) can be \(2, 3, 4, 5, 6\) \(f (3)=2,( f (1), f (2)) \rightarrow(1,1) \rightarrow 6 \text { cases }\) \(f (3)=3,( f (1), f (2)) \rightarrow(1,2),(2,1)\) \(\rightarrow 2 \times 6=12 \text { cases }\)…
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