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

माना \(S=\{1,2,3, \ldots ., 100\}\), तो \(S\) के उन सभी अरिक्त (non-empty) उपसमुच्चयों \(A\) जिनके अवयवों का गुणनफल सम है, की संख्या है 

  1. A \(2^{100} -1\)
  2. B \(2^{50} (2^{50} -1)\)
  3. C \(2^{50} -1\)
  4. D \(2^{50} + 1\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2^{50} (2^{50} -1)\)

Step-by-step Solution

Detailed explanation

Product is even when atleast one element of subset is even Hence required number of subsets = total subsets -number of subsets all whose elements are odd \(= 2^{100} - 2^{50}\)
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