यदि \(A=\{1,2,3,4\}\), तो (P(A)) के कितने अवयवों में (1) हो और (4) न हो?
If \(A=\{1,2,3,4\}\), how many elements of (P(A)) contain (1) but do not contain (4)?
Explanation opens after your attempt
B. (4)
Concept
(1) is fixed and (4) is excluded, so (2,3) have \(2^2=4\) choices. Fix the conditions first.
Why this answer is correct
The correct answer is B. (4). (1) is fixed and (4) is excluded, so (2,3) have \(2^2=4\) choices. Fix the conditions first.
Exam Tip
(1) स्थिर है और (4) हटाया गया है, इसलिए (2,3) के \(2^2=4\) चयन होंगे। शर्तों को पहले स्थिर करें।
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