यदि \(A=\{a,b,c,d,e\}\) है तो ऐसे उपसमुच्चयों की संख्या कितनी होगी जिनमें (a) और (b) दोनों अवश्य हों?
If \(A=\{a,b,c,d,e\}\) then how many subsets contain both (a) and (b) necessarily?
Explanation opens after your attempt
Correct Answer
C. (8)
Concept
After fixing (a) and (b), the remaining (3) elements can be chosen freely. So the number is \(2^3=8\) and fixed elements should be separated in such questions.
Why this answer is correct
The correct answer is C. (8). After fixing (a) and (b), the remaining (3) elements can be chosen freely. So the number is \(2^3=8\) and fixed elements should be separated in such questions.
Exam Tip
(a) और (b) को निश्चित रखने पर बाकी (3) अवयव स्वतंत्र चुने जाते हैं। इसलिए संख्या \(2^3=8\) है और ऐसे प्रश्नों में निश्चित अवयव अलग कर दें।
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