यदि \(U=\{1,2,3,4,5,6,7\}\) और \(A=\{1,2,3\}\) है, तो (A') के proper subsets की संख्या कितनी है?
If \(U=\{1,2,3,4,5,6,7\}\) and \(A=\{1,2,3\}\), how many proper subsets does (A') have?
Explanation opens after your attempt
Correct Answer
C. (15)
Concept
(A'={4,5,6,7}) has (4) elements, so proper subsets are \(2^4-1=15\). In exams, remember to exclude the whole (A').
Why this answer is correct
The correct answer is C. (15). (A'={4,5,6,7}) has (4) elements, so proper subsets are \(2^4-1=15\). In exams, remember to exclude the whole (A').
Exam Tip
(A'={4,5,6,7}) में (4) तत्व हैं, इसलिए proper subsets \(2^4-1=15\) हैं। परीक्षा में पूरा (A') हटाना न भूलें।
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