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

माना \(A =\{ a , b , c \}\) तथा \(B =\{1,2,3,4\}\) हैं, तो समुच्चय \(C =\{ f : A \rightarrow B \mid 2 \in f ( A )\) तथा \(f\) एकैकी नहीं है \(\}\) के अवयवों की संख्या है

  1. A \(18\)
  2. B \(19\)
  3. C \(17\)
  4. D \(20\)
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Answer & Solution

Correct Answer

(B) \(19\)

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Detailed explanation

\(C =\{ f : A \rightarrow B \mid 2 \in f ( A )\) and \(f\) is not one-one \(\}\) Case-I : \(\quad\) If \(f(x)=2 \forall x \in A\) then number of function \(=1\) Case-II : \(\quad\) If \(f(x)=2\) for exactly two elements then total number of many-one function…
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