यदि \(A=\{1,2,3,4\}\) है तो (\mathcal{P}(A)) में कितने उपसमुच्चय (1) को रखते और (4) को नहीं रखते?

If \(A=\{1,2,3,4\}\), how many subsets in (\mathcal{P}(A)) contain (1) and do not contain (4)?

Explanation opens after your attempt
Correct Answer

B. (4)

Step 1

Concept

Keeping (1) and excluding (4) are fixed. For remaining (2,3), there are \(2^2=4\) choices.

Step 2

Why this answer is correct

The correct answer is B. (4). Keeping (1) and excluding (4) are fixed. For remaining (2,3), there are \(2^2=4\) choices.

Step 3

Exam Tip

(1) को रखना और (4) को हटाना तय है। बाकी (2,3) के लिए \(2^2=4\) विकल्प हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A=\{1,2,3,4\}\) है तो (\mathcal{P}(A)) में कितने उपसमुच्चय (1) को रखते और (4) को नहीं रखते? / If \(A=\{1,2,3,4\}\), how many subsets in (\mathcal{P}(A)) contain (1) and do not contain (4)?

Correct Answer: B. (4). Explanation: (1) को रखना और (4) को हटाना तय है। बाकी (2,3) के लिए \(2^2=4\) विकल्प हैं। / Keeping (1) and excluding (4) are fixed. For remaining (2,3), there are \(2^2=4\) choices.

Which concept should I revise for this Mathematics MCQ?

Keeping (1) and excluding (4) are fixed. For remaining (2,3), there are \(2^2=4\) choices.

What exam hint can help solve this Mathematics question?

(1) को रखना और (4) को हटाना तय है। बाकी (2,3) के लिए \(2^2=4\) विकल्प हैं।