यदि \(A=\{1,2,3,4\}\), तो (\mathcal{P}(A)) के कितने तत्वों का अधिकतम तत्व (3) है?

If \(A=\{1,2,3,4\}\), how many elements of (\mathcal{P}(A)) have maximum element (3)?

Explanation opens after your attempt
Correct Answer

B. (4)

Step 1

Concept

Such a subset must contain (3) and must not contain (4). (1,2) are free, so there are \(2^2=4\) subsets.

Step 2

Why this answer is correct

The correct answer is B. (4). Such a subset must contain (3) and must not contain (4). (1,2) are free, so there are \(2^2=4\) subsets.

Step 3

Exam Tip

ऐसे उपसमुच्चय में (3) होना चाहिए और (4) नहीं होना चाहिए। (1,2) स्वतंत्र हैं, इसलिए \(2^2=4\) उपसमुच्चय हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{1,2,3,4\}\), तो (\mathcal{P}(A)) के कितने तत्वों का अधिकतम तत्व (3) है? / If \(A=\{1,2,3,4\}\), how many elements of (\mathcal{P}(A)) have maximum element (3)?

Correct Answer: B. (4). Explanation: ऐसे उपसमुच्चय में (3) होना चाहिए और (4) नहीं होना चाहिए। (1,2) स्वतंत्र हैं, इसलिए \(2^2=4\) उपसमुच्चय हैं। / Such a subset must contain (3) and must not contain (4). (1,2) are free, so there are \(2^2=4\) subsets.

Which concept should I revise for this Mathematics MCQ?

Such a subset must contain (3) and must not contain (4). (1,2) are free, so there are \(2^2=4\) subsets.

What exam hint can help solve this Mathematics question?

ऐसे उपसमुच्चय में (3) होना चाहिए और (4) नहीं होना चाहिए। (1,2) स्वतंत्र हैं, इसलिए \(2^2=4\) उपसमुच्चय हैं।