यदि \(A=\{1,2,3,4\}\), तो (A) के ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें 1 हो या 2 हो?
If \(A=\{1,2,3,4\}\), how many subsets contain 1 or 2?
Explanation opens after your attempt
Correct Answer
B. 12
Concept
There are 16 total subsets, and those containing neither 1 nor 2 are the \(2^2=4\) subsets of ({3,4}). Hence (16-4=12).
Why this answer is correct
The correct answer is B. 12. There are 16 total subsets, and those containing neither 1 nor 2 are the \(2^2=4\) subsets of ({3,4}). Hence (16-4=12).
Exam Tip
कुल 16 उपसमुच्चय हैं और जिनमें न 1 है न 2, वे ({3,4}) के \(2^2=4\) उपसमुच्चय हैं। इसलिए (16-4=12)।
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