यदि \(A=\{1,2,3,4,5\}\), तो (P(A)) के कितने अवयवों में (1) नहीं है और (2) अवश्य है?
If \(A=\{1,2,3,4,5\}\), how many elements of (P(A)) do not contain (1) and must contain (2)?
Explanation opens after your attempt
Correct Answer
B. (8)
Concept
(2) is fixed and (1) is forbidden, so (3,4,5) have \(2^3=8\) choices. Handle compulsory and forbidden elements separately.
Why this answer is correct
The correct answer is B. (8). (2) is fixed and (1) is forbidden, so (3,4,5) have \(2^3=8\) choices. Handle compulsory and forbidden elements separately.
Exam Tip
(2) स्थिर है और (1) निषिद्ध है, इसलिए (3,4,5) के \(2^3=8\) चयन होंगे। अनिवार्य और निषिद्ध अवयव अलग-अलग संभालें।
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