यदि \(A=\{1,2,3,4\}\) है, तो (\mathcal{P}(A)) में ऐसे कितने तत्व हैं जिनमें (1) हो लेकिन (4) न हो?

If \(A=\{1,2,3,4\}\), how many elements of (\mathcal{P}(A)) contain (1) but not (4)?

Explanation opens after your attempt
Correct Answer

B. (4)

Step 1

Concept

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

Step 3

Exam Tip

(1) को रखना और (4) को हटाना निश्चित है। बचे (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 ऐसे कितने तत्व हैं जिनमें (1) हो लेकिन (4) न हो? / If \(A=\{1,2,3,4\}\), how many elements of (\mathcal{P}(A)) contain (1) but not (4)?

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