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

माना \(A :\{1,2,3,4,5,6,7\}\) है। समुच्चय \(B =\) \(\{ T \subseteq A :\) या तो \(1 \notin T\) या \(2 \in T \}\) तथा \(C =\{ T\) \(\subseteq A : T\) के सभी अवयवों का योगफल एक अभाज्य संख्या है हैं। तो समुच्चय \(B \cup C\) में अवययों की संख्या है

  1. A \(107\)
  2. B \(106\)
  3. C \(105\)
  4. D \(108\)
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Answer & Solution

Correct Answer

(A) \(107\)

Step-by-step Solution

Detailed explanation

\(B^{\prime}\) is a set containing sub sets of \(A\) containing element \(1\) and not containing \(2\) . And \(C^{\prime}\) is a set containing subsets of \(A\) whose sum of elements is not prime. So, we need to calculate number of subsets of \(\{3,4,5,6,7\}\) whose sum of…
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