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JEE Mains · Maths · STD 11 - 1. set theory

અહી \(A =\{1,2,3,4,5,6,7\}\) અને \(B =\{3,6,7,9\}\) આપેલ છે. તો ગણ \(\{ C \subseteq A : C \cap B \neq \phi\}\) ની સભ્ય સંખ્યા મેળવો.

  1. A \(111\)
  2. B \(112\)
  3. C \(113\)
  4. D \(114\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(112\)

Step-by-step Solution

Detailed explanation

\(A =\{1,2,3,4,5,6,7\} \text { and }\) \(B =\{3,6,7,9\}\) Total subset of \(A =2^{7}=128\) \(C \cap B =\phi\) when set \(C\) contains the element \(1,2,4,5\) \(\therefore S=\{C \subseteq A ; C \cap B \neq \phi\}\) \(=\operatorname{Total}-(C \cap B=\phi)\) \(=128-2^{4}=112\)
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