यदि \(A=\{a,b,c,d,e,f\}\) है, तो (\mathcal{P}(A)) में ऐसे subsets कितने हैं जिनमें (a) और (b) दोनों हों?
If \(A=\{a,b,c,d,e,f\}\), how many subsets in (\mathcal{P}(A)) contain both (a) and (b)?
Explanation opens after your attempt
Correct Answer
B. (16)
Concept
(a) and (b) are fixed, and the remaining (4) elements give \(2^4=16\) choices. In exams, place compulsory elements first.
Why this answer is correct
The correct answer is B. (16). (a) and (b) are fixed, and the remaining (4) elements give \(2^4=16\) choices. In exams, place compulsory elements first.
Exam Tip
(a) और (b) fixed हैं, बाकी (4) तत्वों पर \(2^4=16\) विकल्प हैं। परीक्षा में compulsory elements को पहले रख दें।
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