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

माना \(\mathrm{A}=\{1,2,3,4,5\}\) तथा \(\mathrm{B}=\{1,2,3,4,5,6\}\) हैं। तो \(f(1)+f(2)=f(4)-1\) को संतुष्ट करने वाले फलनों \(\mathrm{f}: \mathrm{A} \rightarrow \mathrm{B}\) की संख्या है

  1. A \(360\)
  2. B \(361\)
  3. C \(362\)
  4. D \(363\)
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Answer & Solution

Correct Answer

(A) \(360\)

Step-by-step Solution

Detailed explanation

\(f(1)+f(2)+1=f(4) \leq 6\) \(f(1)+f(2) \leq 5\) Case \((i)\) \(f(1)=1 \Rightarrow f(2)=1,2,3,4 \Rightarrow 4\) mappings Case \((ii)\) \(f(1)=2 \Rightarrow f(2)=1,2,3 \Rightarrow 3\) mappings Case \((iii)\) \(f(1)=3 \Rightarrow f(2)=1,2 \Rightarrow 2\) mappings Case \((iv)\)…
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